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| 1 | 26 mA cm-2 JSC achieved in the integrated solar cells显示文摘Organometal halide perovskite has drawn much attention due to their high light-absorption coefficient,outstanding carrier mobility,and long-range charge-transport lengths.The most remarkable progress made by this type of perovskite materials is in the field of photovoltaics[1–4].The power conversion efficiency(PCE)of perovskite solar cells(PSCs)has exceeded 25%since they were first used as the active layer in solar cells in 2009[5]. | Qiaogan Liao Huiliang Sun Bolin Li Xugang Guo | 2019 | Science Bulletin2019，64，23： | 4 |
| 2 | High-performance all-polymer solar cells enabled by a novel low bandgap non-fully conjugated polymer acceptor显示文摘The non-fully conjugated polymer as a new class of acceptor materials has shown some advantages over its small molecular counterpart when used in photoactive layers for all-polymer solar cells(all-PSCs),despite a low power conversion efficiency(PCE)caused by its narrow absorption spectra.Herein,a novel non-fully conjugated polymer acceptor PFY-2TS with a low bandgap of~1.40 eV was developed,via polymerizing a largeπ-fused small molecule acceptor(SMA)building block(namely YBO)with a non-conjugated thioalkyl linkage.Compared with its precursor YBO,PFY-2TS retains a similar low bandgap but a higher LUMO level.Moreover,compared with the structural analog of YBO-based fully conjugated polymer acceptor PFY-DTC,PFY-2TS shows a similar absorption spectrum and electron mobility,but significantly different molecular crystallinity and aggregation properties,which results in optimal blend morphology with a polymer donor PBDB-T and physical processes of the device in all-PSCs.As a result,PFY-2TS-based all-PSCs achieved a PCE of 12.31%with a small energy loss of 0.56 eV enabled by the reduced non-radiative energy loss(0.24 eV),which is better than that of 11.08%for the PFY-DTC-based ones.Our work clearly demonstrated that non-fully conjugated polymers as a new class of acceptor materials are very promising for the development of high-performance all-PSCs. | Qunping Fan Ruijie Ma Tao Liu Jianwei Yu Yiqun Xiao Wenyan Su Guilong Cai Yuxiang Li Wenhong Peng Tao Guo Zhenghui Luo Huiliang Sun Lintao Hou Weiguo Zhu Xinhui Lu Feng Gao Ellen Moons Donghong Yu He Yan Ergang Wang | 2021 | Science China Chemistry2021，64，8： | 3 |
| 3 | Reducing energy loss via tuning energy levels of polymer acceptors for efficient all-polymer solar cells显示文摘The open-circuit voltage(Voc) of all-polymer solar cells(all-PSCs) is typically lower than 0.9 V even for the most efficient ones.Large energy loss is the main reason for limiting Voc and efficiency of all-PSCs. Herein, through materials design using electron deficient building blocks based on bithiophene imides, the lowest unoccupied molecular orbital(LUMO) energy levels of polymer acceptors can be effectively tuned, which resulted in a reduced energy loss induced by charge generation and recombination loss due to the suppressed charge-transfer(CT) state absorption. Despite a negligible driving force, all-PSC based on the polymer donor and acceptor combination with well-aligned energy levels exhibited efficient charge transfer and achieved an external quantum efficiency over 70% while maintaining a large Voc of 1.02 V, leading to a 9.21% efficiency. Through various spectroscopy approaches, this work sheds light on the mechanism of energy loss in all-PSCs, which paves an avenue to achieving efficient all-PSCs with large Voc and drives the further development of all-PSCs. | Huiliang Sun Bin Liu Jianwei Yu Xianshao Zou Guangye Zhang Yujie Zhang Wei Zhang Mengyao Su Qunping Fan Kun Yang Jianhua Chen He Yan Feng Gao Xugang Guo | 2020 | Science China Chemistry2020，63，12： | 2 |
| 4 | A Cost-Effective D-A-D Type Hole-Transport Material Enabling 20% Efficiency Inverted Perovskite Solar Celis显示文摘High-performance,cost-effective hole-transport materials(HTMs)are greatly desired for the commercialization of perovskite solar cells(PVSCs).Herein,two new HTMs,TPA-FO and TPA-PDO,are devised and synthesized,which have a donor-acceptor-donor(D-A-D)type molecule design featuring carbonyl group-functionalized arenes as the acceptor(A)units.The carbonyl group at the central core of HTMs can not only tune frontier molecular orbital(FMO)energy levels and surface wettability,but also can enable efficient surface passivation effects,resulting in reduced recombination loss.When employed as HTMs in inverted PVSCs without using dopant,TPA-FO with one carbonyl group yields a high power conversion efficiency(PCE)of 20.24%,which is among the highest values reported in the inverted PVSCs with dopant-free HTMs.More importantly,the facile one-step synthetic process enables a low cost of 30 USD g^(-1) for TPA-FO,much cheaper than the most studied HTMs used for high-efficiency dopant-free PVSCs.These results demonstrate the potential of D-A-D type molecules with carbonyl group-functionalized arene core in developing the low-cost dopant-free HTMs toward highly efficient PVSCs. | Jiachen Huang Jie Yang Huiliang Sun Kui Feng Qiaogan Liao Bolin Li He Yan Xugang Guo | 2021 | Chinese Journal of Chemistry2021，39，6： | 2 |
| 5 | Optimization of solvent swelling for efficient organic solar cells via sequential deposition显示文摘Compared to bulk heterojunction(BHJ)organic solar cells(OSCs)prepared by the blend casting in“one step process”,sequential deposition(SD)processed OSCs can realize an ideal profile of vertical component distribution due to the swelling of polymer films.Herein,we did trials on several kinds of second solvents for swelling the polymer layer,and investigated the packing structure and morphology of the swollen films and the performance of the resulting devices.We found that an optimized morphology can be achieved by solvent swelling while using orthodichlorobenzene(o-DCB)as the second layer processing-solvent,with polymer donor PffBT-3 as bottom layer,PC71BM as top layer and bicontinuous networks in the middle.Such solvent swelling process also makes the SD method exempt from thermal annealing treatment.The device based on SD yields a power conversion effi-ciency(PCE)up to 8.7%without any post-treatment,outperforming those from the devices based on SD using other solvents and that(7.06%)from BHJ device,respectively.We also extended the use of this approach to allpolymer blend system,and successfully improved the efficiency from 4.72%(chloroform)to 9.35%(o-DCB),which is among the highest PCEs in all-polymer-based OSCs fabricated with SD method.The results demonstrate that the swelling of the polymer by the second layer solvent is a necessity for SD,paving the way towards additivefree high-performance OSCs. | Qiaogan Liao Bangbang Li Huiliang Sun Chang Woo Koh Xianhe Zhang Bin Liu Han Young Woo Xugang Guo | 2021 | Materials Reports(Energy)2021，1，4： | 1 |
| 6 | Over 16% efficiency all-polymer solar cells by sequential deposition显示文摘All-polymer solar cells(all-PSCs) have received extensive attention due to their excellent mechanical robustness and performance stability. However, the power conversion efficiency(PCE) of all-PSCs still lags behind those of organic solar cells(OSCs)based on non-fullerene small molecule acceptors. Herein, we report highly efficient all-PSCs via sequential deposition(SD) with donor and acceptor layers coated sequentially to optimize the film microstructure. Compared with the bulk heterojunction(BHJ)all-PSCs, an optimized morphology with vertical component distribution was achieved for the SD-processed all-PSCs due to the synergistic effect of swelling of polymer films and using additive. Such strategy involves using chlorobenzene as the first layer processing-solvent for polymer donor, chloroform as the second processing-solvent for polymer acceptor with trace 1-chloronaphthalene, efficiently promoting exciton dissociation and charge extraction and reducing trap-assisted recombination.Consequently, over 16% all-PSCs fabricated via SD method was realized for the first time, which is much higher than that(15.2%) of its BHJ counterpart and also among the highest PCEs in all-PSCs. We have further demonstrated the generality of this approach in various all-polymer systems. This work indicates that the SD method can yield excellent all-PSCs and provides a facile approach to fabricating high-performance all-PSCs. | Bangbang Li Xuanyu Zhang Ziang Wu Jie Yang Bin Liu Qiaogan Liao Junwei Wang Kui Feng Rui Chen Han Young Woo Fei Ye Li Niu Xugang Guo Huiliang Sun | 2022 | Science China Chemistry2022，65，6： | 1 |
| 7 | Recent progress in low-cost noncovalently fused-ring electron acceptors for organic solar cells显示文摘The power conversion efficiencies(PCEs)of organic solar cells(OSCs)have improved considerably in recent years with the development of fused-ring electron acceptors(FREAs).Currently,FREAs-based OSCs have achieved high PCEs of over 19%in single-junction OSCs.Whereas the relatively high synthetic complexity and the low yield of FREAs typically result in high production costs,hindering the commercial application of OSCs.In contrast,noncovalently fused-ring electron acceptors(NFREAs)can compensate for the shortcomings of FREAs and facilitate large-scale industrial production by virtue of the simple structure,facile synthesis,high yield,low cost,and reasonable efficiency.At present,OSCs based on NFREAs have exceeded the PCEs of 15%and are expected to reach comparable efficiency as FREAs-based OSCs.Here,recent advances in NFREAs in this review provide insight into improving the performance of OSCs.In particular,this paper focuses on the effect of the chemical structures of NFREAs on the molecule conformation,aggregation,and packing mode.Various molecular design strategies,such as core,side-chain,and terminal group engineering,are presented.In addition,some novel polymer acceptors based on NFREAs for all-polymer OSCs are also introduced.In the end,the paper provides an outlook on developing efficient,stable,and low-cost NFREAs for achieving commercial applications. | Qingqing Bai Qiming Liang Henan Li Huiliang Sun Xugang Guo Li Niu | 2022 | Aggregate2022，3，6： | 1 |
| 8 | Polymer acceptors for all-polymer solar cells显示文摘Bulk-heterojunction polymer solar cells(PSCs)as a clean and renewable energy resource have attracted great attention from both academia and industry[1−20].Recently non-fullerene PSCs based on polymer donors(PDs)and small molecule acceptors(SMAs)have achieved remarkable success with the power conversion efficiencies(PCEs)over 18%[21−26]. | Xiaofei Ji Zuo Xiao Huiliang Sun Xugang Guo Liming Ding | 2021 | Journal of Semiconductors2021，42，8： | 0 |
| 9 | PY-IT,an Excellent Polymer Acceptor显示文摘All-polymer solar cells(all-PSCs)have attracted considerable attention due to their inherent advantages over other types of organic solar cells,including superior optical and thermal stability,as well as exceptional mechanical durability.Recently,all-PSCs have experienced remarkable advancements in device performance thanks to the invention of polymerized small-molecule acceptors(PSMAs)since 2017.Among these PSMAs,PY-IT has garnered immense interest from the scientific community due to its exceptional performance in all-PSCs.In this review,we presented the design principles of PY-IT and discussed the various strategies employed in device engineering for PY-IT-based all-PSCs.These strategies include additive and interface engineering,layer-by-layer processing methods,meniscus-assisted coating methods,and ternary strategy.Furthermore,this review highlighted several novel polymeric donor materials that are paired with PY-IT to achieve efficient all-PSCs.Lastly,we summarized the inspiring strategies for further advancing all-PSCs based on PY-IT.These strategies aim to enhance the overall performance and stability of all-PSCs by exploring new materials,optimizing device architectures,and improving fabrication techniques.By leveraging these approaches,we anticipate significant progress in the development of all-PSCs and their potential as a viable renewable energy source. | Qingqing Bai Qiming Liang Qian Liu Bin Liu Xugang Guo Li Niu Huiliang Sun | 2023 | Chinese Journal of Chemistry2023，41，24： | 0 |
| 10 | Revisiting the Bithiophene Imide-Based Polymer Donors: Molecular Aggregation and Orientation Control Enabling New Polymer Donors for High-Performance All-Polymer Solar Cells显示文摘Bithiophene imide (BTI)-based polymers have been promising photovoltaic materials due to their high mobility and tunable energy levels. However, BTI polymers have rarely been revisited since organic solar cells (OSCs) entered the era of non-fullerene electron acceptors (NFEA) likely owing to their incompatibility with NFEAs. Herein, fine-tuning the aggregation and orientation of BTI-based donor-π-acceptor (D-π-A) polymer donors was achieved by incorporating the linear n-octyl group into thiophene π-bridge. The resulting polymer donor G15 shows excellent compatibility with NFEA L15 (polymer acceptor). The G15-based all-polymer OSCs achieve high power conversion efficiency of 15.17%. This is significantly higher than that (< 5%) of its analogue with isomerized branched alkyl chains and also among the highest values for all-polymer OSCs. The results highlight that well-tailored BTI polymer donors are attractive photovoltaic materials for further exploration in non-fullerene organic solar cells. | Jie Yang Bin Liu Jin-Woo Lee Yimei Wang Huiliang Sun Zhicai Chen Qingqing Bai Bumjoon J.Kim Yan Jiang Li Niu Xugang Guo | 2022 | Chinese Journal of Chemistry2022，40，24： | 0 |
| 11 | Low temperature spark plasma sintering of TC4/HA composites显示文摘Ti6Al4V/hydroxyapatite composites(TC4/HA) have been prepared by high energy ball milling and low temperature spark plasma sintering at 600 °C, 550 °C, 500 °C and 450 °C, respectively. The sintering temperature of the composites was sharply decreased as the result of the activation and sur fi cial modi fi cation effects induced from high energy ball milling. The decomposition and reaction of hydroxyapatite was successfully avoided, which offers the composites superior biocompatibility. The hydroxyapatite in the composites was distributed in gap uniformly, and formed an ideal network structure. The lowest hardness, compressive strength and Young's modulus of the composites satisfy the requirements of human bone. | Huiliang Shao Lei Cao Daqian Sun Zhankui Zhao | 2016 | Progress in Natural Science:Materials International2016，26，2： | 0 |
| 12 | Regioisomeric Polymer Semiconductors Based on Cyano-Functionalized Dialkoxybithiophenes:Structure-Property Relationship and Photovoltaic Performance显示文摘Cyano substitution is vital to the molecular design of polymer semiconductors toward highly efficient organic solar cells.However,how regioselectivity impacts relevant optoelectronic properties in cyano-substituted bithiophene systems remain poorly understood.Three regioisomeric cyano-functionalized dialkoxybithiophenes BT_(HH),BT_(HT),and BT_(TT) with headto-head,head-to-tail,and tail-to-tail linkage,respectively,were synthesized and characterized in this work.The resulting polymer semiconductors(PBDTBTs)based on these building blocks were prepared accordingly.The regiochemistry and property relationships of PBDTBTs were investigated in detail.The BTHH moiety has a higher torsional barrier than the analogs BT_(HT) and BT_(TT),and the regiochemistry of dialkoxybithiophenes leads to fine modulation in the optoelectronic properties of these polymers,such as optical absorption,band gap,and energy levels of frontier molecular orbitals.Organic field-effect transistors based on PBDTBT_(HH) had higher hole mobility(4.4×10^(-3) cm^(2)/(V·s))than those(ca.10^(-4) cm^(2)/(V·s))of the other two polymer analogs.Significantly different short-circuit current densities and fill factors were obtained in polymer solar cells using PBDTBTs as the electron donors.Such difference was probed in greater detail by performing space-charge-limited current mobility,thin-film morphology,and transient photocurrent/photovoltage characterizations.The findings highlight that the BTHH unit is a promising building block for the construction of polymer donors for highperformance organic photovoltaic cells. | Qingqing Bai Jun Huang Han Guo Suxiang Ma Jie Yang Bin Liu Kun Yang Huiliang Sun Han Young Woo Li Niu Xugang Guo | 2022 | Transactions of Tianjin University2022，28，5： | 0 |
| 13 | Advances in Green-Solvent-Processable All-Polymer Solar Cells显示文摘All-polymer solar cells(all-PSCs)have significantly improved long-term stability and mechanical stretchability.The power conversion efficiency(PCE)of all-PSCs has been rapidly improved from∼1%to now over∼17%,driven by rational molecular design,blend morphology optimization,and device engineering.However,most all-PSCs are generally processed with halogenated solvents,hazardous for human health and the global environment.Achieving high-performance all-PSCs with halogen-free solvent processing remains a challenge.This feature article presents recent advances in green-solvent-processable all-PSCs from the material design and morphological control perspective,and further reviews progress in using more environmentally friendly solvents(i.e.,water or alcohol)to achieve genuinely sustainable and environmentally friendly manufacturing all-PSCs.Finally,we provide an outlook on the challenges and opportunities for large-scale manufacturing of green-solvent-processable all-PSCs. | Qingqing Bai Huiliang Sun Xugang Guo Li Niu | 2022 | Chinese Journal of Polymer Science2022，40，8： | 0 |
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