Department of Chemistry , KTH Royal Institute of Technology , Stockholm SE-10044 , Sweden.
ACS Appl Mater Interfaces. 2018 Nov 14;10(45):38970-38977. doi: 10.1021/acsami.8b15130. Epub 2018 Oct 30.
There has been a growing interest in the design and synthesis of non-fullerene electron transport materials (ETMs) for perovskite solar cells (PSCs), which may overcome the drawbacks of traditional fullerene derivatives. In this work, a novel donor-acceptor (D-A) structured ETM termed TPA-3CN is presented by molecular engineering of triphenylamine (TPA) as the donor group and (3-cyano-4,5,5-trimethyl-2(5 H)-furanylidene) malononitrile as the acceptor group. To further improve the electron mobility and conductivity and achieve excellent photovoltaic performance, a solution processable n-type dopant is introduced during the ETM spin-coating step. After device optimization, PSCs based on the doped TPA-3CN exhibit an impressive power conversion efficiency (PCE) of 19.2% with a negligible hysteresis. Benefitting from the low temperature and good solution processability of ETM TPA-3CN, it was further applied in flexible inverted PSCs and an impressive PCE of 13.2% was achieved, which is among the highest values reported for inverted flexible fullerene-free PSCs.
人们对设计和合成用于钙钛矿太阳能电池（PSCs）的非富勒烯电子传输材料（ETM）越来越感兴趣，这可能克服传统富勒烯衍生物的缺点。在这项工作中，通过对三苯胺（TPA）作为供体基团和（3-氰基-4,5,5-三甲基-2(5H)-呋喃亚基）丙二腈作为受体基团的分子工程，设计了一种新型的给体-受体（D-A）结构的 ETM，称为 TPA-3CN。为了进一步提高电子迁移率和导电性并实现优异的光伏性能，在 ETM 旋涂步骤中引入了一种可溶液加工的 n 型掺杂剂。经过器件优化，基于掺杂 TPA-3CN 的 PSCs 表现出令人印象深刻的功率转换效率（PCE）为 19.2%，几乎没有滞后。得益于 ETM TPA-3CN 的低温和良好的溶液加工性能，它进一步应用于柔性倒置 PSCs，并实现了令人印象深刻的 13.2%的 PCE，这是报道的最高倒置柔性无富勒烯 PSCs 值之一。
