Methylammonium Bismuth Iodide as a Lead-Free, Stable Hybrid Organic-Inorganic Solar Absorber
Methylammonium Bismuth Iodide as a Lead-Free, Stable Hybrid Organic-Inorganic Solar Absorber
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DOI：
10.1002/chem.201505055
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发表时间：
2016-02-18
影响因子：
4.3
通讯作者：
Buonassisi, Tonio
中科院分区：
文献类型：
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作者：
Hoye, Robert L. Z.;Brandt, Riley E.;Buonassisi, Tonio
甲基卤化铅铵（MAPbX(3)）钙钛矿表现出特殊的载流子输运特性。但是它们作为太阳能吸收器的商业部署目前受到限制，因为它们在湿度和铅含量存在时的内在不稳定性。在理论预测的指导下，我们通过详细的材料表征探索了碘化铋甲基铵（MBI）作为太阳能吸收剂的潜力。采用液相法和气相法合成了相纯MBI。与MAPbX(3)相比，MBI是空气稳定的，形成的表层不会增加复合速率。我们发现MBI在室温下的发光，气相处理的薄膜表现出优越的光致发光（PL）衰减时间，这对光伏应用很有希望。符合这些性质的MBI的热力学、电子和结构特征也存在于其他杂化三元卤化铋化合物中。通过MBI，我们展示了MAPbX(3)的无铅和稳定替代品，具有相似的电子结构和纳秒寿命。
Methylammonium lead halide (MAPbX(3)) perovskites exhibit exceptional carrier transport properties. But their commercial deployment as solar absorbers is currently limited by their intrinsic instability in the presence of humidity and their lead content. Guided by our theoretical predictions, we explored the potential of methylammonium bismuth iodide (MBI) as a solar absorber through detailed materials characterization. We synthesized phase-pure MBI by solution and vapor processing. In contrast to MAPbX(3), MBI is air stable, forming a surface layer that does not increase the recombination rate. We found that MBI luminesces at room temperature, with the vapor-processed films exhibiting superior photoluminescence (PL) decay times that are promising for photovoltaic applications. The thermodynamic, electronic, and structural features of MBI that are amenable to these properties are also present in other hybrid ternary bismuth halide compounds. Through MBI, we demonstrate a lead-free and stable alternative to MAPbX(3) that has a similar electronic structure and nanosecond lifetimes.