甲脒
锡
材料科学
正交晶系
四方晶系
碘化物
钙钛矿(结构)
晶体结构
无机化学
化学工程
化学
结晶学
冶金
工程类
作者
Chao-Ming Tsai,Yu-Pei Lin,Murali Krishna Pola,Sudhakar Narra,Efat Jokar,Yichuan Yang,Eric Wei‐Guang Diau
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2018-08-08
卷期号:3 (9): 2077-2085
被引量:60
标识
DOI:10.1021/acsenergylett.8b01046
摘要
Alcohol-based bifunctional ammonium cations, 2-hydroxyethylammonium (HEA+), HO(CH2)2NH3+, were introduced into formamidinium (FA+) tin-based perovskites (HEAxFA1–xSnI3; x = 0–1) to absorb light in carbon-based mesoscopic solar cells. We found that HEA+ cations play a key role to control the crystal structures, the lattice structures altered from orthorhombic (x = 0) to rhombohedral (x = 0.2–0.4) with greater symmetry. When x was increased to 0.6–1.0, tin and iodide vacancies were formed to generate 3D-vacant perovskites (HEAxFA1–xSn0.67I2.33, x ≥ 0.6) with a tetragonal structure. Tin-based perovskites in this series were fabricated into mesoporous solar cells using one-step drop-cast (DC), two-step solvent-extraction (SE), and SE + 3% ethylenediammonium diiodide (EDAI2) as an additive. After optimization of device performance with the SE + 3% EDAI2 approach, the HEA0.4FA0.6SnI3 (HEAI = 40%) device gave the best photovoltaic performance with JSC = 18.52 mA cm–2, VOC = 371 mV, FF = 0.562, and overall efficiency η = 3.9% after the device was stored for a period of 340 h.
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