Non-fullerene acceptor photostability and its impact on organic solar cell lifetime
Non-fullerene acceptor photostability and its impact on organic solar cell lifetime
复制标题
DOI：
10.1016/j.xcrp.2021.100498
复制
发表时间：
2021-07-21
影响因子：
8.9
通讯作者：
Li, Zhe
中科院分区：
文献类型：
--
作者：
Clarke, Andrew J.;Luke, Joel;Li, Zhe
非富勒烯受体（nfa）的发展促进了高效有机太阳能电池（OSCs）的实现，具有最小的烧损和优异的长期稳定性。然而，NFA分子结构对器件稳定性的作用尚不清楚，限制了基于NFA的osc的商业化。本文研究了由不同的nfa （O-IDTBR、EH-IDTBR、ITIC和tic - m）与给体聚合物（PTB7-Th、PffBT4T-2OD和PBDB-T）共混制备的10种OSC器件的光稳定性。O-IDTBR和EH-IDTBR使用这三种聚合物形成高度稳定的器件，而ITIC和ITIC- m器件则存在烧损和长期降解的问题。发现构象不稳定性是导致ITIC和tic - m光稳定性差的原因，从而导致器件稳定性差。连接末端基团与ITIC和ITIC- m分子主链的化学键的扭曲和潜在断裂会导致不希望发生的构象变化。提出了克服这种有害光诱导的nfa构象变化的潜在策略。
The development of non-fullerene acceptors (NFAs) has facilitated the realization of efficient organic solar cells (OSCs) with minimal burn-in losses and excellent long-term stability. However, the role of NFA molecular structures on device stability remains unclear, limiting commercialization of NFA-based OSCs. Herein, the photostability of 10 OSC devices, fabricated with various NFAs (O-IDTBR, EH-IDTBR, ITIC, and ITIC-M) blended with donor polymers (PTB7-Th, PffBT4T-2OD, and PBDB-T), is investigated. O-IDTBR and EH-IDTBR form highly stable devices with all three polymers, whereas ITIC and ITIC-M devices suffer from burn-in losses and long-term degradation. Conformational instability is found to be responsible for the poor photostability of ITIC and ITIC-M, resulting in poor device stability. Twisting and potential breakage of the chemical bond that links the end group to the main backbone of ITIC and ITIC-M molecules causes undesirable conformational changes. Potential strategies to overcome such detrimental photo-induced conformational changes in NFAs are proposed.