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| 1 | A chlorinated low-bandgap small-molecule acceptor for organic solar cells with 14.1% efficiency and low energy loss显示文摘A new acceptor-donor-acceptor(A-D-A) type small-molecule acceptor NCBDT-4 Cl using chlorinated end groups is reported.This new-designed molecule demonstrates wide and efficient absorption ability in the range of 600–900 nm with a narrow optical bandgap of 1.40 eV. The device based on PBDB-T-SF:NCBDT-4 Cl shows a power conversion efficiency(PCE) of 13.1%without any post-treatment, which represents the best result for all as-cast organic solar cells(OSCs) to date. After device optimizations, the PCE was further enhanced to over 14% with a high short-circuit current density(Jsc) of 22.35 m A cm-2 and a fill-factor(FF) of 74.3%. The improved performance was attributed to the more efficient photo-electron conversion process in the optimal device. To our knowledge, this outstanding efficiency of 14.1% with an energy loss as low as 0.55 eV is among the best results for all single-junction OSCs. | Bin Kan Huanran Feng Huifeng Yao Meijia Chang Xiangjian Wan Chenxi Li Jianhui Hou Yongsheng Chen | 2018 | Science China Chemistry2018，61，10： | 9 |
| 2 | The prior rules of designing Ti_(3)C_(2)T_(x) MXene-based gas sensors显示文摘Working temperature,sensitivity,and selectivity are some of the characteristics of the applied gas sensors.How to design and fabricate an ideal gas sensor working at room temperature is still challenging and attracting lots of interest.Two-dimensional(2D)materials with ultra-thin structure have been demonstrated as a family of ideal candidates to achieve this goal.Among them,Ti_(3)C_(2)T_(x) MXene,a kind of layered sheet synthesized by selectively etching MAX phases materials,shows remarkable potential to be the sensitive materials solely or in a composite.However,their designing rules are still lacking critical thinking from the viewpoint of the intrinsic property of Ti_(3)C_(2)T_(x) MXene based materials.In this article,two critical features,i.e.,the thickness of the sensitive materials,and the scope of the analytes,are elaborated towards Ti_(3)C_(2)T_(x) MXene based gas sensors after characterizing the performance of sensing reducing gases(NH3 and CO)and oxidizing gas(NO2).First,the thinner the Ti_(3)C_(2)T_(x) MXene sensitive layer,the better the sensitivity.Second,the Ti_(3)C_(2)T_(x) MXene based gas sensor is not suitable for strong and moderate oxidation gas due to its ease of oxidation.These two rules are demonstrated,and could be considered with priority both in the future researches and practical applications. | Yingying Jian Danyao Qu Lihao Guo Yujin Zhu Chen Su Huanran Feng Guangjian Zhang Jia Zhang Weiwei Wu Ming-Shui Yao | 2021 | Frontiers of Chemical Science and Engineering2021，15，3： | 3 |
| 3 | Side chain engineering investigation of non-fullerene acceptors for photovoltaic device with efficiency over 15%显示文摘Side chain engineering plays a substantial role for high-performance organic solar cells (OSCs).Herein,a series of non-fullerene acceptor (NFA) molecules with A-D-A structures,TTCn-4F,with gradient substituent lengths of terminal side chains (T-SCs) on the molecular backbones have been designed and synthesized.The effects of T-SCs length,ranging from hydrogen atom to n-dodecyl,their optoelectronic properties,thin film molecular packing,blend film morphology,and overall photovoltaic performance have been systematically studied.The results show that among this series of molecules,TTC8-4F with n-octyl substituent,showed the best photovoltaic performance when applied with PM6 as the donor due to its favorable morphology,balanced charge mobility,effective exciton dissociation and less charge recombination.Based on this,its ternary device with F-Br as the secondary acceptor achieved a high PCE of 15.34%with the simultaneously enhanced Voc of 0.938 V,Jscof 22.66 mA cm^-2,and FF of 72.15%.These results indicate that the engineering of T-SCs is an effective strategy for designing high-performance NFAs. | Xin Zhang Yunqian Ding Huanran Feng Huanhuan Gao Xin Ke Hongtao Zhang Chenxi Li Xiangjian Wan Yongsheng Chen | 2020 | Science China Chemistry2020，63，12： | 2 |
| 4 | A series of dithienobenzodithiophene based small molecules for highly efficient organic solar cells显示文摘Three acceptor-donor-acceptor(A-D-A) small molecules DCAODTBDT,DRDTBDT and DTBDTBDT using dithieno[2,3-d:2',3'-d']benzo[l,2-b:4,5-b']dithiophene as the central building block,octyl cyanoacetate,3-octylrhodanine and thiobarbituric acid as the end groups were designed and synthesized as donor materials in solution-processed photovoltaic cells(OPVs).The impacts of these different electron withdrawing end groups on the photophysical properties,energy levels,charge carrier mobility,morphologies of blend films,and their photovoltaic properties have been systematically investigated.OPVs device based on DRDTBDT gave the best power conversion efficiency(PCE) of 8.34%,which was significantly higher than that based on DCAODTBDT(4.83%) or DTBDTBDT(3.39%).These results indicate that rather dedicated and balanced consideration of absorption,energy levels,morphology,mobility,etc.for the design of small-molecule-based OPVs(SM-OPVs)and systematic investigations are highly needed to achieve high performance for SM-OPVs. | Huanran Feng Miaomiao Li Wang Ni Bin Kan Yunchuang Wang Yamin Zhang Hongtao Zhang Xiangjian Wan Yongsheng Chen | 2017 | Science China Chemistry2017，60，4： | 1 |
| 5 | A new oligobenzodithiophene end-capped with 3-ethyl-rhodanine groups for organic solar cells with high open-circuit voltage显示文摘A new solution-processable small-molecule donor material,named DRBDT3,comprised of oligobenzo[1,2-b:4,5-b']dithiophene as the backbone and 3-ethyl-rhodanine as the end-capped group has been designed and synthesized for application in organic photovoltaic cells.The oligobenzodithiophene derivative exhibits an absorption band from 300 to 640 nm.The film of DRBDT3 shows highly long-range ordering assembly and high mobility of 1.21×10 4 cm2 V 1 s 1.The new molecule shows a deep highest-occupied molecular orbital energy level.The device based on DRBDT3 as the donor and PC71BM as the acceptor exhibits a power conversion efficiency of 4.09%with a high open-circuit voltage of 0.99 V under AM.1.5G illumination(100m W cm2). | Wang Ni Miaomiao Li Xiangjian Wan Yi Zuo Bin Kan Huanran Feng Qian Zhang Yongsheng Chen | 2015 | Science China Chemistry2015，58，2： | 0 |
| 6 | Dithienopyrrole Based Small Molecule with Low Band Gap for Organic Solar Cells显示文摘低乐队差距 acceptor-donor-acceptor (A-D-A ) 小分子施主材料,命名 DR3TDTN,为处理答案的器官的太阳能电池被设计了并且综合。DR3TDTN 表演从 300 ~ 820 nm 与 1.49 eV 和宽广吸收光谱的价值缩小光乐队差距。DR3TDTN 的人和 LUMO 精力层次分别地是 −4.74 和 −3.26 eV。优化光电的设备基于 DR3TDTN : 聚氯联苯 71B BM 混合电影与 0.67 V 的开电路的电压显示出 3.03% 的功率变换效率, 8.22 mA·cmP −2 的电线走火电流并且充满 0.55 的因素。 | Miaomiao Li Wang Ni Huanran Feng Bin Kan Xiangjian Wan Yamin Zhang Xuan Yang Yongsheng Chen | 2015 | Chinese Journal of Chemistry2015，33，8： | 0 |
| 7 | Exploring ternary organic photovoltaics for the reduced nonradiative recombination and improved efficiency over 17.23%with a simple large-bandgap small molecular third component显示文摘Ternary strategy is one of the most effective methods to further boost the power conversion efficiency(PCE)of organic photovoltaic cells(OPVs).In terms of high-efficiency PM6:Y6 binary systems,there is still room to further reduce energy_(loss)(E_(loss))through regulating molecular packing and aggregation by introducing a third component in the construction of ternary OPVs.Here we introduce a simple molecule BR1 based on an acceptor-donor-acceptor(A-D-A)structure with a wide bandgap and high crystallinity into PM6:Y6-based OPVs.It is proved that BR1 can be selectively dispersed into the donor phase in the PM6:Y6 and reduce disorder in the ternary blends,thus resulting in lower E_(loss,non-rad)and E_(loss).Furthermore,the mechanism study reveals well-develop phase separation morphology and complemented absorption spectra in the ternary blends,leading to higher charge mobility,suppressed recombination,which concurrently contributes to the significantly improved PCE of 17.23%for the ternary system compared with the binary ones(16.21%).This work provides an effective approach to improve the performance of the PM6:Y6-based OPVs by adopting a ternary strategy with a simple molecule as the third component. | Huanran Feng Yvjie Dai Lihao Guo Di Wang Hao Dong Zhihui Liu Lu Zhang Yvjin Zhu Chen Su Yongsheng Chen Weiwei Wu | 2022 | Nano Research2022，15，4： | 0 |
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