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Parallel Evaluation of the BiI3, BiOI, and Ag3BiI6 Layered Photoabsorbers
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-03-30 , DOI: 10.1021/acs.chemmater.9b04925 Andrea Crovetto 1 , Alireza Hajijafarassar 2 , Ole Hansen 2 , Brian Seger 1 , Ib Chorkendorff 1 , Peter C. K. Vesborg 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-03-30 , DOI: 10.1021/acs.chemmater.9b04925 Andrea Crovetto 1 , Alireza Hajijafarassar 2 , Ole Hansen 2 , Brian Seger 1 , Ib Chorkendorff 1 , Peter C. K. Vesborg 1
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The bismuth-based (oxy)iodides BiI3, BiOI, and AgxBiIx+3 share similar layered crystal structures, optimal band gaps for top absorbers in tandem solar cells, and moderate synthesis temperatures. Similarly to halide perovskite absorbers, they contain a heavy cation with a lone pair of electrons (Bi3+), which has been proposed as an important feature enabling defect tolerance in perovskites. The aim of this work is to grow and characterize BiI3, BiOI, and Ag3BiI6 absorbers and solar cells using a consistent synthesis and analysis routine. In this way, the individual strengths and weaknesses of the three absorbers, as well as their common challenges, can be outlined. The proposed synthesis method based on (oxy)iodization of metallic precursor films results in similar room-temperature photoluminescence features in all three materials, possibly indicating a similar degree of defect tolerance. At the device level, the open circuit voltage of BiI3 solar cells and the fill factor of BiOI solar cells are improved compared to their respective state of the art. To improve short circuit currents, control of growth orientation should be a priority in view of the anisotropic properties of these compounds. P-type bulk doping and selection of hole transport layers with deep valence bands are also key areas for future work. Beyond photovoltaics, the very low (<1.1) dark diode ideality factor in BiI3 devices and the existence of both electronic and ionic conduction in Ag3BiI6 may open up applications in other areas of optoelectronics.
中文翻译：
BiI 3，BiOI和Ag 3 BiI 6层状光吸收剂的并行评估
铋基碘氧化物BiI 3，BiOI和Ag x BiI x +3具有相似的层状晶体结构，串联太阳能电池中顶部吸收体的最佳带隙以及适中的合成温度。与卤化物钙钛矿吸收剂相似，它们包含带有一个孤对电子（Bi 3+）的重阳离子，已提出这是使钙钛矿能够容忍缺陷的重要特征。这项工作的目的是生长和表征BiI 3，BiOI和Ag 3 BiI 6吸收剂和太阳能电池使用一致的合成和分析程序。这样，可以概述这三个吸收器的各自优点和缺点以及它们的共同挑战。所提出的基于金属前体膜的（氧）碘化的合成方法会在所有三种材料中产生相似的室温光致发光特征，可能表明缺陷容忍度相似。在设备级别，BiI 3的开路电压与它们各自的现有技术相比，太阳能电池和BiOI太阳能电池的填充因子得到了改善。考虑到这些化合物的各向异性，为改善短路电流，应优先控制生长方向。P型体掺杂和具有深价带的空穴传输层的选择也是未来工作的关键领域。除光伏外，BiI 3器件中的极低暗二极管理想因子（<1.1）以及Ag 3 BiI 6中电子和离子传导的存在可能会打开光电子学的其他领域。
更新日期：2020-03-30
中文翻译：
BiI 3，BiOI和Ag 3 BiI 6层状光吸收剂的并行评估
铋基碘氧化物BiI 3，BiOI和Ag x BiI x +3具有相似的层状晶体结构，串联太阳能电池中顶部吸收体的最佳带隙以及适中的合成温度。与卤化物钙钛矿吸收剂相似，它们包含带有一个孤对电子（Bi 3+）的重阳离子，已提出这是使钙钛矿能够容忍缺陷的重要特征。这项工作的目的是生长和表征BiI 3，BiOI和Ag 3 BiI 6吸收剂和太阳能电池使用一致的合成和分析程序。这样，可以概述这三个吸收器的各自优点和缺点以及它们的共同挑战。所提出的基于金属前体膜的（氧）碘化的合成方法会在所有三种材料中产生相似的室温光致发光特征，可能表明缺陷容忍度相似。在设备级别，BiI 3的开路电压与它们各自的现有技术相比，太阳能电池和BiOI太阳能电池的填充因子得到了改善。考虑到这些化合物的各向异性，为改善短路电流，应优先控制生长方向。P型体掺杂和具有深价带的空穴传输层的选择也是未来工作的关键领域。除光伏外，BiI 3器件中的极低暗二极管理想因子（<1.1）以及Ag 3 BiI 6中电子和离子传导的存在可能会打开光电子学的其他领域。
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