钝化
卤化物
钙钛矿(结构)
碘化物
材料科学
微晶
钙钛矿太阳能电池
碘化铵
太阳能电池
化学工程
无机化学
铵
介电谱
化学
纳米技术
物理化学
光电子学
有机化学
电极
电化学
图层(电子)
冶金
工程类
作者
Teresa S. Ripolles,Patricio Serafini,Carlos Redondo-Obispo,Esteban Climent‐Pascual,Sofia Masi,Iván Mora‐Seró,Carmen Coya
标识
DOI:10.1002/ente.202100890
摘要
In spite of the outstanding properties of metal halide perovskites, its polycrystalline nature induces a wide range of structural defects that results in charge losses that affect the final device performance and stability. Herein, a surface treatment is used to passivate interfacial vacancies and improve moisture tolerance. A functional organic molecule, phenylethyl ammonium iodide (PEAI) salt, is dissolved with the antisolvent step. The additive used at low concentration does not induce formation of low‐dimensional perovskites species. Instead, the organic halide species passivate the surface of the perovskite and grain boundaries, which results in an effective passivation. For sake of generality, this facile solution‐processed synthesis was studied for halide perovskite with different compositions, the standard perovskite MAPbI 3 , and double cation perovskites, MA 0.9 Cs 0.1 PbI 3 and MA 0.5 FA 0.5 PbI 3 , increasing the average photoconversion efficiency compared to the reference cell by 18%, 32%, and 4% respectively, observed for regular, n‐i‐p, and inverted, p‐i‐n, solar cell configurations. This analysis highlights the generality of this approach for halide perovskite materials in order to reduce nonradiative recombination as observed by impedance spectroscopy.
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