材料科学
掺杂剂
电子迁移率
堆积
钙钛矿(结构)
基质(水族馆)
半导体
光电子学
有机半导体
兴奋剂
纳米技术
结晶学
化学
物理
海洋学
核磁共振
地质学
作者
Zhiwen Zhou,Qisheng Wu,Rui Cheng,Hong Zhang,Sijia Wang,Mojun Chen,Maohai Xie,Paddy K. L. Chan,Michaël Grätzel,Shien‐Ping Feng
标识
DOI:10.1002/adfm.202011270
摘要
Crystallized p-type small-molecule semiconductors have great potential as an efficient and stable hole transporting materials (HTMs) for perovskite solar cells (PSCs) due to their relatively high hole mobility, good stability, and tunable highest occupied molecular orbitals. Here, a thienoacene-based organic semiconductor, 2,9-diphenyldinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DPh-DNTT), is thermally evaporated and employed as the dopant-free HTM that can be scaled up for large-area fabrication. By controlling the deposition temperature, the molecular orientation is modulated into a dominant face-on orientation with π–π stacking direction perpendicular to the substrate surface, maximizing the out-of-plane carrier mobility. With an engineered face-on orientation, the DPh-DNTT film shows an improved out-of-plane mobility of 3.3 × 10−2 cm2 V−1 s−1, outperforming the HTMs reported so far. Such orientation-reinforced mobility contributes to a remarkable efficiency of 20.2% for CH3NH3PbI3 inverted PSCs with enhanced stability. The results reported here provide insights into engineering the orientation of molecules for the dopant-free organic HTMs for PSCs.
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