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Strongly Enhanced Photovoltaic Performance and Defect Physics of Air‐Stable Bismuth Oxyiodide (BiOI)
Advanced Materials ( IF 27.4 ) Pub Date : 2017-07-17 , DOI: 10.1002/adma.201702176 Robert L. Z. Hoye 1, 2, 3 , Lana C. Lee 2 , Rachel C. Kurchin 3 , Tahmida N. Huq 2 , Kelvin H. L. Zhang 2 , Melany Sponseller 3 , Lea Nienhaus 3 , Riley E. Brandt 3 , Joel Jean 3 , James Alexander Polizzotti 3 , Ahmed Kursumović 2 , Moungi G. Bawendi 3 , Vladimir Bulović 3 , Vladan Stevanović 4, 5 , Tonio Buonassisi 3 , Judith L. MacManus-Driscoll 2
Advanced Materials ( IF 27.4 ) Pub Date : 2017-07-17 , DOI: 10.1002/adma.201702176 Robert L. Z. Hoye 1, 2, 3 , Lana C. Lee 2 , Rachel C. Kurchin 3 , Tahmida N. Huq 2 , Kelvin H. L. Zhang 2 , Melany Sponseller 3 , Lea Nienhaus 3 , Riley E. Brandt 3 , Joel Jean 3 , James Alexander Polizzotti 3 , Ahmed Kursumović 2 , Moungi G. Bawendi 3 , Vladimir Bulović 3 , Vladan Stevanović 4, 5 , Tonio Buonassisi 3 , Judith L. MacManus-Driscoll 2
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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.
中文翻译：
空气稳定铋氧化物（BiOI）的光伏性能和缺陷物理性能得到了大大提高
铋基化合物作为潜在的无毒且耐缺陷的太阳能吸收剂最近受到越来越多的关注。但是，最近研究的许多新材料显示出有限的光伏性能。在本文中，通过理论和实验对一种这样的化合物进行了详细的研究：氧化碘化铋（BiOI）。BiOI薄膜通过化学气相传输生长，发现在环境空气中保持相同的四方相至少197 d。计算表明BiOI可以耐受反位和空位缺陷。全无机太阳能电池（ITO | NiO x证明了在选择的单色激发下具有可忽略的磁滞和高达80％的外部量子效率的| BiOI | ZnO | Al）。在AM 1.5G照明下，短路电流密度和功率转换效率几乎是以前报道的BiOI太阳能电池以及许多小组最近探索的其他卤化铋和卤化黄铜光伏电池的两倍。通过使用光学特性分析，光发射光谱学和器件建模进行详细的损耗分析，为将来提高效率提供了方向。这项工作表明，BiOI以前被认为是不良的光催化剂，有望用于光伏。
更新日期：2017-07-17
中文翻译：
空气稳定铋氧化物（BiOI）的光伏性能和缺陷物理性能得到了大大提高
铋基化合物作为潜在的无毒且耐缺陷的太阳能吸收剂最近受到越来越多的关注。但是，最近研究的许多新材料显示出有限的光伏性能。在本文中，通过理论和实验对一种这样的化合物进行了详细的研究：氧化碘化铋（BiOI）。BiOI薄膜通过化学气相传输生长，发现在环境空气中保持相同的四方相至少197 d。计算表明BiOI可以耐受反位和空位缺陷。全无机太阳能电池（ITO | NiO x证明了在选择的单色激发下具有可忽略的磁滞和高达80％的外部量子效率的| BiOI | ZnO | Al）。在AM 1.5G照明下，短路电流密度和功率转换效率几乎是以前报道的BiOI太阳能电池以及许多小组最近探索的其他卤化铋和卤化黄铜光伏电池的两倍。通过使用光学特性分析，光发射光谱学和器件建模进行详细的损耗分析，为将来提高效率提供了方向。这项工作表明，BiOI以前被认为是不良的光催化剂，有望用于光伏。
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