Understanding the Morphology of High-Performance Solar Cells Based on a Low-Cost Polymer Donor
Understanding the Morphology of High-Performance Solar Cells Based on a Low-Cost Polymer Donor
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了解基于低成本聚合物供体的高性能太阳能电池的形态
DOI：
10.1021/acsami.9b22666
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发表时间：
2020
影响因子：
9.5
通讯作者：
Wang Dong
中科院分区：
文献类型：
--
作者：
Xu Zhengqing;Pan Fei;Sun Chenkai;Hong Song;Chen Shanshan;Yang Changduk;Zhang Zhiguo;Liu Yao;Russell Thomas P.;Li Yongfang;Wang Dong
一种低成本、高性能的体异质结（BHJ）太阳能电池，包含一种新兴的聚合物供体，聚[（噻吩）-alt-(6,7-二氟-2-（2-己基癸氧基）喹啉](PTQ10)，其效率为12.7%。为了提高太阳能电池的性能，更好地理解基于ptq10的器件的结构-性能关系至关重要。在此，我们制作了PTQ10/非富勒烯和富勒烯BHJ器件，包括PTQ10/IDIC， PTQ10/ITIC和PTQ10/PC71BM，并对其形貌和性能之间的关系进行了详细的描述。发现PTQ10与非富勒烯IDIC和ITIC受体高度混溶，与富勒烯PC71BM受体混溶性差。热退火促进了PTQ10的结晶和PTQ10/IDIC、PTQ10/ITIC和PTQ10/PC71BM器件的相分离，导致PTQ10/IDIC和PTQ10/ITIC器件的功率转换效率（PCE）提高，而添加1,8-二碘辛烷（DIO）的PTQ10/PC71BM器件的PCE降低。在不进行热处理的情况下，DIO极大地改善了PTQ10/PC71BM的形貌，从而提高了PCE。结果表明，PTQ10基器件中的相分离程度和有序程度对器件性能有显著影响。所证明的形态-性能相关性将有助于这些低成本聚合物供体太阳能电池的合理设计，以实现更高的性能。
A low-cost and high-performance bulk heterojunction (BHJ) solar cell comprising an emerging polymer donor, poly[(thiophene)-alt-(6,7-difluoro-2-(2-hexyldecyloxy)quinoxaline)] (PTQ10), shows an efficiency of 12.7%. To improve the performance of the solar cells, a better understanding of the structure–property relationships of the PTQ10-based devices is crucial. Here, we fabricate PTQ10/nonfullerene and fullerene BHJ devices, including PTQ10/IDIC, PTQ10/ITIC, and PTQ10/PC71BM, processed with or without thermal annealing and additive and provide detailed descriptions of the relationships between the morphology and performance. PTQ10 is found to be highly miscible with nonfullerene IDIC and ITIC acceptors and poorly miscible with fullerene PC71BM acceptors. Thermal annealing promotes the crystallization of PTQ10 and phase separation of all PTQ10/IDIC, PTQ10/ITIC, and PTQ10/PC71BM devices, leading to an increased power conversion efficiencies (PCEs) of the PTQ10/IDIC and PTQ10/ITIC devices but a decreased PCE of PTQ10/PC71BM devices with 1,8-di-iodooctane (DIO) additive. Without thermal annealing, DIO greatly improves the morphology of PTQ10/PC71BM, leading to a higher PCE. The results show that the degree of phase separation and ordering in the PTQ10-based devices significantly influences device performance. The morphology–property correlations demonstrated will assist in the rational design of these low-cost polymer donor-based solar cells to achieve even higher performance.