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| 1 | Organic photovoltaic cell with 17% efficiency and superior processability显示文摘The development of organic photoactive materials,especially the newly emerging non-fullerene electron acceptors(NFAs),has enabled rapid progress in organic photovoltaic(OPV)cells in recent years.Although the power conversion efficiencies(PCEs)of the top-performance OPV cells have surpassed 16%,the devices are usually fabricated via a spin-coating method and are not suitable for large-area production.Here,we demonstrate that the fine-modification of the flexible side chains of NFAs can yield 17%PCE for OPV cells.More crucially,as the optimal NFA has a suitable solubility and thus a desirable morphology,the high efficiencies of spin-coated devices can be maintained when using scalable blade-coating processing technology.Our results suggest that optimization of the chemical structures of the OPV materials can improve device performance.This has great significance in larger-area production technologies that provide important scientific insights for the commercialization of OPV cells. | Yong Cui Huifeng Yao Ling Hong Tao Zhang Yabing Tang Baojun Lin Kaihu Xian Bowei Gao Cunbin An Pengqing Bi Wei Ma Jianhui Hou | 2020 | National Science Review2020，7，7： | 7 |
| 2 | A ternary organic solar cell with 300 nm thick active layer shows over 14% efficiency显示文摘In order to meet the requirements for making organic solar cells(OSCs)through solution printing techniques,great efforts have been devoted into developing high performance OSCs with relatively thicker active layers.In this work,a thick-film(300 nm)ternary OSC with a power conversion efficiency of 14.3%is fabricated by introducing phenyl-C61-butyric-acid-methyl ester(PC61BM)into a PBDB-T-2Cl:BTP-4 F host blend.The addition of PC61BM is found to be helpful for improving the hole and electron mobilities,and thus facilitates charge transport as well as suppresses charge recombination in the active layers,leading to the improved efficiencies of OSCs with relatively thicker active layers.Our results demonstrate the feasibility of employing fullerene derivative PC61BM to construct a high-efficiency thick-film ternary device,which would promote the development of thick layer ternary OSCs to fulfill the requirements of future roll to roll production. | Lijiao Ma Ye Xu Yunfei Zu Qing Liao Bowei Xu Cunbin An Shaoqing Zhang Jianhui Hou | 2020 | Science China Chemistry2020，63，1： | 2 |
| 3 | Significant influence of doping effect on photovoltaic performance of efficient fullerene-free polymer solar cells显示文摘The modification mechanism of the water/alcohol cathode interlayer is one of the most complicated problems in the field of organic photovoltaics,which has not been clearly elucidated yet;this greatly restricts the further enhancement of the PCE for polymer solar cells.Herein,we clarified the different effects of PFN and its derivatives,namely,poly[(9,9-bis(3’-((N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)](PFN-Br) in modifying fullerene-free PSCs.It is found for the first time that doping on IT-4F by the amino group of PFN leads to the unfavorable charge accumulation,and hence,forms a dense layer of electronegative molecule due to the poor electron transport capacity of the non-fullerene acceptor IT-4F.The electronegative molecular layer can block the electron transfer from the active layer to the interlayer and cause serious charge recombination at the active layer/cathode interface.This mechanism could be verified by the ESR measurement and electron-only devices.By replacing PFN with PFN-Br,the excessive doping effect between the cathode interlayer and IT-4F is eliminated,by which the charge transport and collection can be greatly improved.As a result,a high PCE of 13.5%was achieved in the fullerene-free PSCs. | Qian Kang Qi Wang Cunbin An Chang He Bowei Xu Jianhui Hou | 2020 | Journal of Energy Chemistry2020，29，4： | 1 |
| 4 | Optimizing polymer aggregation and blend morphology for boosting the photovoltaic performance of polymer solar cells via a random terpolymerization strategy显示文摘Compared to regular conjugated polymers,the random conjugated terpolymers are usually not beneficial to achieve highly efficient non-fullerene(NF)-based polymer solar cells(PSCs)due to their disordered chemical structures.In this work,we report two random terpolymer donors(PBNB80 and PBNB50)by tuning the molar ratio of electron-accepting units of 1,3-di(thiophen-2-yl)naphtho[2,3-c]thiophene-4,9-dione(NTD)and 1,3-bis(4-chlorothiophen-2-yl)-4 H,8 H-benzo[1,2-c:4,5-c’]dithiophene-4,8-dione(ClBDD),at the same time,the parent polymers(PBNB100 and PBNB00)are also compared to study.These four polymer donors exhibit similar optical bandgaps and gradually deepen highest occupied molecular orbital levels.Importantly,aggregation and self-organization properties of the random terpolymer donors are optimized,which result in the better morphology and crystal coherence length after blending with NF acceptor of BO-4 Cl.Particularly,a PBNB80:BO-4 Cl blend forms an optimal nanoscale phase-separation morphology,thereby producing an outstanding power conversion efficiency of 16.0%,which is much higher than those(12.8%and 10.7%)of their parent binary polymer donor-based devices.This work demonstrates that rational using terpolymerization strategy to prepare random terpolymer is a very important method to achieve highly efficient NF-PSCs. | Tao Zhang Cunbin An Qianglong Lv Jinzhao Qin Yong Cui Zhong Zheng Bowei Xu Shaoqing Zhang Jianqi Zhang Chang He Jianhui Hou | 2021 | Journal of Energy Chemistry2021，30，8： | 1 |
| 5 | Enhanced intermolecular interactions to improve twisted polymer photovoltaic performance显示文摘In polymer solar cells(PSCs), twisted polymer donors usually have low photovoltaic efficiencies due to their poor photoactive layer morphologies. Herein, we successfully improved twisted polymer(PBDT-3T) photovoltaic efficiency by employing C=O groups(PBDT-3TCO) to enhance intermolecular interactions. The maximum power conversion efficiency(PCE) of PBDT-3T is only 1.05%, while the PCE of PBDT-3TCO reaches 11.77% in non-fullerene(NF) PSCs. Both polymers-based PSCs show very similar open-circuit voltages but remarkable differences in their short-circuit currents and fill factors. The single crystals of both functionalized terthiophenes with methyl substituents demonstrate that the terthiophene with C=O units changes molecular pattern by forming intra/inter molecular S???O and O???H interactions but its molecular planarity does not significantly improve.Our comparative studies show that PBDT-3TCO with C=O units possesses a strong aggregation property and optimal photoactive layer morphology in NF PSCs. This study provides important insight into the design of high-performance twisted polymer donors for NF PSCs. | Cunbin An Jingming Xin Lanlan Shi Wei Ma Jianqi Zhang Huifeng Yao Sunsun Li Jianhui Hou | 2019 | Science China Chemistry2019，62，3： | 1 |
| 6 | Modulation of terminal alkyl chain length enables over 15% efficiency in small-molecule organic solar cells显示文摘In small-molecule organic solar cells(SM-OSCs),it remains a big challenge to obtain favorable bulk heterojunction morphology by donor material design.Herein,we design and synthesize three small-molecule donors BPF3T-C4,BPF3T-C6 and BPF3T-C8,with different terminal alkyl chains.Although they possess similar absorption profiles and molecular energy levels,their crystallinity gradually decreases with the chain length of the terminal alkyl chains.After blending with an electron acceptor of BO-4Cl,the crystallinity is suppressed and the packing orientations of these donors changed from edge-on to face-on.Simultaneously,the crystallinity of BO-4Cl is gradually weakened with the chain length of the terminal alkyl chain of donor materials.Finally,The BPF3T-C6 with moderate crystallinity exhibits the best phase-separation morphology among these blend films.As a result,the BPF3T-C6:BO-4Cl-based SM-OSC shows an impressive power conversion efficiency of 15.1%. | Qianglong Lv Cunbin An Tao Zhang Jianqi Zhang Shaoqing Zhang Pengxin Zhou Chang He Jianhui Hou | 2021 | Science China Chemistry2021，64，7： | 0 |
| 7 | Efficient Small-Molecule Organic Solar Cells by Modulating Fluorine Substitution Position of Donor Material显示文摘Comprehensive Summary The fluorine substitution position in organic semiconductors is critical in improving device performance for organic solar cells(OSCs).Herein,two similar small-molecule donors,B3T-PoF and B3T-PmF,are designed and synthesized,which only differ on the fluorine substitution position on the pendent benzene unit.Although both small-molecule donors exhibit similar absorption profiles and molecular energy levels,B3T-PmF has stronger crystallinity and lower energetic disorder than B3T-PoF.After blending with the non-fullerene acceptor of BO-4Cl,B3T-PmF shows better phase separation and more ordered molecular packing in blend film.As a result,the B3T-PoF:BO-4Cl-based OSC shows a power conversion efficiency(PCE)of 12.3%.In contrast,the B3T-PmF:BO-4Cl-based cell demonstrates obviously increased JSC and FF values,thus yielding an excellent PCE of 14.7%.This study indicates that reasonable selection of fluorine atom substitution position in conjugated side chains is one of the promising strategies for achieving high-performance SM-DSCs. | Tao Zhang Qianglong Lv Zhongxiang Peng Cunbin An Pengqing Bi Ye Xu Ni Yang Jingwen Wang Kaihu Xian Long Ye Shaoqing Zhang Jianhui Hou | 2023 | Chinese Journal of Chemistry2023，41，7： | 0 |
| 8 | Benzo[1,2‑b:4,5‑b′]dithiophene-Based Conjugated Polymers for Highly Efficient Organic Photovoltaics显示文摘In the past several years,power conversion efficiencies(PCEs)of bulk heterojunction(BHJ)single-junction organic photovoltaic(OPV)cells have increased rapidly because of the innovation of photovoltaic materials,including polymer donors and nonfullerene acceptors(NFAs),device engineering,and morphology optimization.The development of photovoltaic materials has been deemed as the core to imporve the PCEs of OPV cells.Regarding the diversification of NFAs,the rational design of polymer donors is becoming more and more challenging,because an ideal polymer donor is required not only to meet matched molecular energy levels and complementary absoprtion spectra with NFAs but also to improve BHJ morphology and electroluminescence quantum efficiency of OPV cells.Among tens of thousands of polymer donors,benzo[1,2-b:4,5-b′]dithiophene(BDT)-containing conjugated polymers have become dominant donor materials because they are closely related to the frequent breakthroughs in the PCEs of OPV cells.A comprehensive understanding of the correlation among their chemical structures,optical properties,aggregation behaviors,and photovoltaic efficiencies is urgently required to develop nextgeneration outstanding polymer donors.In this Account,we focus on the molecular design strategies of BDT-containing polymer donors with the goal of developing new photovoltaic materials for fabricating the state-of-the-art OPV cells.First,we summarize our recent achievements in developing highefficiency BDT-containing polymer donors.In the meantime,the role of surface electrostatic potentials of active layer materials on exciton dissociation of BHJ layer is briefly discussed;the influence of fluorine and chlorine atoms in polymer donors on molecular energy levels,molecular torsion,and photovoltaic efficiencies is analyzed in detail.Second,to pursue higher PCEs of OPV cells,we highlight the following three aspects for in-depth discussion of the BDT-based polymer donor design.(i)The BHJ morphologies are regulated by changing the steric hindrance of the flexible chains,intermolecular interactions,and side chain orientations of polymers to modulate their aggregation in solution.(ii)The optical gaps of polymer donors are fine-controlled by combining the theories of the frontier orbitals hybrid and electron delocalization to develop the ideal polymer materials for versatile applications of OPV cells.(iii)The reduction of nonradiative recombination energy losses of OPV cells is discussed in detail by adding a third component,the reduction of energetic offsets of active layer materials,and the development of polymer donor with strong electroluminescence quantum efficiency.On the basis of the aforementioned molecular design considerations,we achieved PCEs up to 19.0%,20.2%,and 28.4%for single-junction,double-junction,and indoor light OPV cells,respectively.Lastly,we briefly discuss the opportunities and challenges to further improve the PCEs of OPV cells. | Cunbin An Jianhui Hou | 2022 | Accounts of Materials Research2022，3，5： | 0 |
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