材料科学
卤化物
成核
光伏
钙钛矿(结构)
能量转换效率
结晶度
正交晶系
化学工程
太阳能电池
甲脒
纳米技术
结晶学
无机化学
光电子学
光伏系统
晶体结构
化学
有机化学
复合材料
工程类
生物
生态学
作者
Essa A. Alharbi,Thomas Baumeler,Anurag Krishna,A. Alyamani,Felix T. Eickemeyer,Olivier Ouellette,Linfeng Pan,Fahad S. Alghamdi,Zaiwei Wang,Mohammad Hayal Alotaibi,Bowen Yang,Masaud Almalki,Mounir Mensi,Hamad Albrithen,Abdulrahman Albadri,Anders Hagfeldt,Shaik M. Zakeeruddin,Michaël Grätzel
标识
DOI:10.1002/aenm.202003785
摘要
Abstract The performance of perovskite solar cells is highly dependent on the fabrication method; thus, controlling the growth mechanism of perovskite crystals is a promising way towards increasing their efficiency and stability. Herein, a multi‐cation halide composition of perovskite solar cells is engineered via the two‐step sequential deposition method. Strikingly, it is found that adding mixtures of 1D polymorphs of orthorhombic δ‐RbPbI 3 and δ‐CsPbI 3 to the PbI 2 precursor solution induces the formation of porous mesostructured hexagonal films. This porosity greatly facilitates the heterogeneous nucleation and the penetration of FA (formamidinium)/MA (methylammonium) cations within the PbI 2 film. Thus, the subsequent conversion of PbI 2 into the desired multication cubic α‐structure by exposing it to a solution of formamidinium methylammonium halides is greatly enhanced. During the conversion step, the δ‐CsPbI 3 also is fully integrated into the 3D mixed cation perovskite lattice, which exhibits high crystallinity and superior optoelectronic properties. The champion device shows a power conversion efficiency (PCE) over 22%. Furthermore, these devices exhibit enhanced operational stability, with the best device retaining more than 90% of its initial value of PCE under 1 Sun illumination with maximum power point tracking for 400 h.
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