钙钛矿(结构)
带隙
光伏
材料科学
光电子学
光伏系统
载流子
卤化物
能量转换效率
表面光电压
纳米技术
化学
结晶学
无机化学
光谱学
电气工程
工程类
物理
量子力学
作者
Adharsh Rajagopal,Ryan J. Stoddard,Sae Byeok Jo,Hugh W. Hillhouse,Alex K.‐Y. Jen
出处
期刊:Nano Letters
[American Chemical Society]
日期:2018-05-07
卷期号:18 (6): 3985-3993
被引量:97
标识
DOI:10.1021/acs.nanolett.8b01480
摘要
Development of large bandgap (1.80–1.85 eV Eg) perovskite is crucial for perovskite–perovskite tandem solar cells. However, the performance of 1.80–1.85 eV Eg perovskite solar cells (PVKSCs) are significantly lagging their counterparts in the 1.60–1.75 eV Eg range. This is because the photovoltage (Voc) does not proportionally increase with Eg due to lower optoelectronic quality of conventional (MA,FA,Cs)Pb(I,Br)3 and results in a photovoltage plateau (Voc limited to 80% of the theoretical limit for ∼1.8 eV Eg). Here, we incorporate phenylethylammonium (PEA) in a mixed-halide perovskite composition to solve the inherent material-level challenges in 1.80–1.85 eV Eg perovskites. The amount of PEA incorporation governs the topography and optoelectronic properties of resultant films. Detailed structural and spectroscopic characterization reveal the characteristic trends in crystalline size, orientation, and charge carrier recombination dynamics and rationalize the origin of improved material quality with higher luminescence. With careful interface optimization, the improved material characteristics were translated to devices and Voc values of 1.30–1.35 V were achieved, which correspond to 85–87% of the theoretical limit. Using an optimal amount of PEA incorporation to balance the increase in Voc and the decrease in charge collection, a highest power conversion efficiency of 12.2% was realized. Our results clearly overcome the photovoltage plateau in the 1.80–1.85 eV Eg range and represent the highest Voc achieved for mixed-halide PVKSCs. This study provides widely translatable insights, an important breakthrough, and a promising platform for next-generation perovskite tandems.
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