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| Suppressing trap states and energy loss by optimizing vertical phase distribution through ternary strategy in organic solar cells | |
| 作者姓名： | Pengqing Bi Shaoqing Zhang Tong Xiao Minghuan Cui Zhihao Chen Junzhen Ren Chaochao Qin Guanghao Lu Xiaotao Hao Jianhui Hou |
| 作者单位： | State Key Laboratory of Polymer Physics and Chemistry;State Key Laboratory of Crystal Materials;School of Chemistry and Biology Engineering;Frontier Institute of Science and Technology;Department of Physics |
| 基金项目： | supported by the National Natural Science Foundation of China(21835006,21704004);the Fundamental Research Funds for the Central Universities,China(FRF-TP-19-047A2);China Postdoctoral Science Foundation(2019M660799)。 |
| 摘 要： | Suppressing the trap-state density and the energy loss via ternary strategy was demonstrated.Favorable vertical phase distribution with donors(acceptors)accumulated(depleted)at the interface of active layer and charge extraction layer can be obtained by introducing appropriate amount of polymer acceptor N2200 into the systems of PBDB-T:IT-M and PBDB-TF:Y6.In addition,N2200 is gradiently distributed in the vertical direction in the ternary blend film.Various measurements were carried out to study the effects of N2200 on the binary systems.It was found that the optimized morphology especially in vertical direction can significantly decrease the trap state density of the binary blend films,which is beneficial for the charge transport and collection.All these features enable an obvious decrease in charge recombination in both PBDB-T:IT-M and PBDB-TF:Y6 based organic solar cells(OSCs),and power conversion efficiencies(PCEs)of 12.5%and 16.42%were obtained for the ternary OSCs,respectively.This work indicates that it is an effective method to suppress the trap state density and thus improve the device performance through ternary strategy. |
| 关 键 词： | non-fullerene organic solar cells ternary strategy vertical phase distribution trap state density energy loss |
Suppressing trap states and energy loss by optimizing vertical phase distribution through ternary strategy in organic solar cells |
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| Pengqing Bi,Shaoqing Zhang,Tong Xiao,Minghuan Cui,Zhihao Chen,Junzhen Ren,Chaochao Qin,Guanghao Lu,Xiaotao Hao,Jianhui Hou.Suppressing trap states and energy loss by optimizing vertical phase distribution through ternary strategy in organic solar cells[J].中国科学 化学(英文版),2021,64(4):599-607. | |
| Authors: | Bi Pengqing Zhang Shaoqing Xiao Tong Cui Minghuan Chen Zhihao Ren Junzhen Qin Chaochao Lu Guanghao Hao Xiaotao Hou Jianhui |
| Institution: | 1.State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China ;2.State Key Laboratory of Crystal Materials, School of Physics, Shandong University, Jinan, 250100, China ;3.School of Chemistry and Biology Engineering, University of Science and Technology Beijing, Beijing, 100083, China ;4.Frontier Institute of Science and Technology, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, 710054, China ;5.Department of Physics, Henan Normal University, Xinxiang, 453007, China ; |
| Abstract: | Suppressing the trap-state density and the energy loss via ternary strategy was demonstrated. Favorable vertical phase distribution with donors(acceptors) accumulated(depleted) at the interface of active layer and charge extraction layer can be obtained by introducing appropriate amount of polymer acceptor N2200 into the systems of PBDB-T:IT-M and PBDB-TF:Y6. In addition, N2200 is gradiently distributed in the vertical direction in the ternary blend film. Various measurements were carried out to study the effects of N2200 on the binary systems. It was found that the optimized morphology especially in vertical direction can significantly decrease the trap state density of the binary blend films, which is beneficial for the charge transport and collection. All these features enable an obvious decrease in charge recombination in both PBDB-T:IT-M and PBDB-TF:Y6 based organic solar cells(OSCs), and power conversion efficiencies(PCEs) of 12.5% and 16.42% were obtained for the ternary OSCs, respectively. This work indicates that it is an effective method to suppress the trap state density and thus improve the device performance through ternary strategy. |
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