Superior Performance of Silver Bismuth Iodide Photovoltaics Fabricated via Dynamic Hot‐Casting Method under Ambient Conditions,Advanced Energy Materials

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Superior Performance of Silver Bismuth Iodide Photovoltaics Fabricated via Dynamic Hot‐Casting Method under Ambient Conditions
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-10-14 , DOI: 10.1002/aenm.201802051
Biplab Ghosh _{1,

2} , Bo Wu ₃ , Xintong Guo ₂ , Padinhare Cholakkal Harikesh _{1,

2} , Rohit Abraham John ₄ , Tom Baikie ₁ , Arramel ₅ , Andrew T. S. Wee ₅ , Claude Guet _{1,

4} , Tze Chien Sum ₃ , Subodh Mhaisalkar _{1,

4} , Nripan Mathews _{1,

4}

Affiliation

Bismuth‐based ternary halides have recently gained a lot of attention as lead‐free perovskite materials. However, photovoltaic performances of these devices remain poor, mostly due to their low‐dimensional crystal structure and large bandgap. Here, a dynamic hot casting technique to fabricate silver bismuth iodide‐based perovskite solar cells under an ambient atmosphere with power conversion efficiencies above 2.5% is demonstrated. Silver bismuth iodides are 3D analogs of complex ternary bismuth halides with a suitable bandgap for a single junction solar cell. As far as it is known, these results represent the highest efficiency for solution processed air‐stable lead‐free perovskite solar cells. The enhanced solar cell performance via this dynamic hot casting technique can be attributed to long carrier lifetimes, micrometer‐sized crystalline grains, and pinhole free thin‐film formation with uniform morphology. This work provides a new direction for fabrication of solution‐processed lead‐free perovskite solar cells with a rapid fabrication strategy irrespective of the processing environment.

中文翻译：

动态热浇铸法在环境条件下制备的碘化银铋光伏电池的优异性能

铋基三元卤化物作为无铅钙钛矿材料最近引起了广泛关注。但是，这些设备的光伏性能仍然很差，这主要是由于它们的低维晶体结构和大的带隙。在此，展示了一种动态热铸造技术，该技术可在环境气氛下以高于2.5％的功率转换效率制造碘化银铋基钙钛矿型太阳能电池。碘化银铋是复杂的三元卤化铋的3D类似物，具有适用于单结太阳能电池的带隙。据了解，这些结果代表了经溶液处理的空气稳定的无铅钙钛矿太阳能电池的最高效率。通过这种动态热浇铸技术提高的太阳能电池性能可以归因于较长的载流子寿命，微米级的晶粒，形态均匀的无针孔薄膜形成。这项工作为采用溶液制造方法的无铅钙钛矿太阳能电池的制造提供了新的方向，该战略与制造环境无关地提供了快速的制造策略。

更新日期：2018-10-14

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