材料科学
钙钛矿(结构)
接受者
偶极子
还原(数学)
光电子学
钙钛矿太阳能电池
光伏系统
太阳能电池
结晶学
凝聚态物理
化学
物理
生物
有机化学
数学
生态学
几何学
作者
Caiyi Zhang,Weiyu Kong,Tianhao Wu,Xuesong Lin,Yongzhen Wu,Jotaro Nakazaki,Hiroshi Segawa,Xudong Yang,Yiqiang Zhang,Han Li,Han Li
标识
DOI:10.1021/acsami.1c11683
摘要
Inverted perovskite solar cells (IPSCs) attract growing interest because of their simple configuration, reliable stability, and compatibility with tandem applications. However, the power conversion efficiency (PCE) of IPSCs still lags behind their regular counterparts, mainly due to the more serious nonradiative loss. Here, we design three donor-π-acceptor (D-π-A) dipoles with various dipole moments to introduce extra electric fields at the interface of perovskites and electron transport materials via the binding between the carboxylate end group and under-coordinated divalent Pb. The chemical binding reduces the recombination centers, while the superposition of the built-in electric field facilitates the electron collection and the hole blocking. As a result, the nonradiative loss is diminished as the dipole moments of D-π-A dipoles increase, which contributes to a PCE of 21.4% with enhancement in both the open-circuit voltage and fill factor. The stability for an unencapsulated device is also improved due to the hydrophobic property of D-π-A dipoles.
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