Strongly Enhanced Photovoltaic Performance and Defect Physics of Air-Stable Bismuth Oxyiodide (BiOI)
Strongly Enhanced Photovoltaic Performance and Defect Physics of Air-Stable Bismuth Oxyiodide (BiOI)
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DOI：
10.1002/adma.201702176
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发表时间：
2017-09-27
影响因子：
29.4
通讯作者：
MacManus-Driscoll, Judith L.
中科院分区：
文献类型：
--
作者：
Hoye, Robert L. Z.;Lee, Lana C.;MacManus-Driscoll, Judith L.
铋基化合物作为潜在的无毒和耐缺陷的太阳能吸收剂最近获得了越来越多的关注。然而，最近研究的许多新材料显示出有限的光伏性能。在此，通过理论和实验详细探讨了一种这样的化合物：碘氧化铋（BiOI）。BiOI薄膜生长的化学气相传输，并发现在环境空气中至少197天保持相同的四氢呋喃相。计算表明BiOI是容忍反位和空位缺陷。全无机太阳能电池（ITO| NiOx| BiOI| ZnO| Al）具有可忽略的滞后和高达80%的外量子效率下选择单色激发证明。在AM 1.5G照明下的短路电流密度和功率转换效率几乎是先前报道的BiOI太阳能电池的两倍，以及许多小组最近探索的其他卤化铋和硫代卤化物光致发光材料。通过详细的损耗分析，使用光学特性，光电子能谱，和设备建模，为未来的效率提高的方向。这项工作表明，BiOI，以前被认为是一个穷人的光催化剂，是有前途的光催化剂。
Bismuth-based compounds have recently gained increasing attention as potentially nontoxic and defect-tolerant solar absorbers. However, many of the new materials recently investigated show limited photovoltaic performance. Herein, one such compound is explored in detail through theory and experiment: bismuth oxyiodide (BiOI). BiOI thin films are grown by chemical vapor transport and found to maintain the same tetragonal phase in ambient air for at least 197 d. The computations suggest BiOI to be tolerant to antisite and vacancy defects. All-inorganic solar cells (ITO|NiOx|BiOI|ZnO|Al) with negligible hysteresis and up to 80% external quantum efficiency under select monochromatic excitation are demonstrated. The short-circuit current densities and power conversion efficiencies under AM 1.5G illumination are nearly double those of previously reported BiOI solar cells, as well as other bismuth halide and chalcohalide photovoltaics recently explored by many groups. Through a detailed loss analysis using optical characterization, photoemission spectroscopy, and device modeling, direction for future improvements in efficiency is provided. This work demonstrates that BiOI, previously considered to be a poor photocatalyst, is promising for photovoltaics.