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A New Electron Acceptor with meta‐Alkoxyphenyl Side Chain for Fullerene‐Free Polymer Solar Cells with 9.3% Efficiency
Advanced Science ( IF 15.1 ) Pub Date : 2017-08-17 , DOI: 10.1002/advs.201700152
Zhenzhen Zhang 1 , Liuliu Feng 1 , Shutao Xu 1 , Ye Liu 1 , Hongjian Peng 1 , Zhi-Guo Zhang 2 , Yongfang Li 2 , Yingping Zou 1
Affiliation  

A new small molecule acceptor, m‐ITIC‐OR, based on indacenodithieno[3,2‐b]thiophene core with meta‐alkoxyphenyl side chains, is designed and synthesized. The m‐ITIC‐OR film shows broader and redshift absorption compared to its solution and matched energy levels with a hexafluoroquinoxaline‐based polymer donor‐HFQx‐T. Here, polymer solar cells (PSCs) by blending an HFQx‐T donor and an m‐ITIC‐OR acceptor as an active layer deliver the power conversion efficiency (PCE) of 6.36% without any posttreatment. The investigations demonstrate that the HFQx‐T:m‐ITIC‐OR blend films possess higher and more balanced charge mobility, negligible bimolecular recombination, and nanoscale interpenetrating morphology after thermal annealing (TA) treatment. Through a simple TA treatment at 150 °C for 5 min, an impressive PCE of 9.3% is obtained. This efficiency is among one of the highest PCEs for additive free PSCs. This is the first time alkoxyphenyl side chain is introduced into nonfullerene electron acceptor; more interestingly, the new electron acceptor (m‐ITIC‐OR) in this work shows a great potential for highly efficient photovoltaic properties.

中文翻译:

一种具有间烷氧基苯基侧链的新型电子受体,用于无富勒烯聚合物太阳能电池,效率为 9.3%

设计并合成了一种新的小分子受体m-ITIC-OR,其基于​​具有间烷氧基苯基侧链的茚并二噻吩并[3,2- b ]噻吩核心。与其溶液相比,m-ITIC-OR 薄膜显示出更宽的红移吸收,并且与基于六氟喹喔啉的聚合物供体-HFQx-T 匹配的能级。在这里,聚合物太阳能电池(PSC)通过混合 HFQx-T 供体和 m-ITIC-OR 受体作为活性层,无需任何后处理即可实现 6.36% 的功率转换效率(PCE)。研究表明,热退火(TA)处理后,HFQx-T:m-ITIC-OR共混薄膜具有更高、更平衡的电荷迁移率、可忽略的双分子复合和纳米级互穿形貌。通过在 150 °C 下简单的 TA 处理 5 分钟,获得了 9.3% 的令人印象深刻的 PCE。该效率是无添加剂 PSC 中最高的 PCE 之一。首次将烷氧基苯基侧链引入非富勒烯电子受体;更有趣的是,这项工作中的新型电子受体(m-ITIC-OR)显示出高效光伏特性的巨大潜力。
更新日期:2017-08-17
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