Photovoltaic enhancement of bismuth halide hybrid perovskite by N-methyl pyrrolidone-assisted morphology conversion
Photovoltaic enhancement of bismuth halide hybrid perovskite by N-methyl pyrrolidone-assisted morphology conversion
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DOI：
10.1039/c6ra28190g
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Miyasaka, Tsutomu
中科院分区：
文献类型：
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作者：
Kulkarni, Ashish;Singh, Trilok;Miyasaka, Tsutomu
低毒性和高度稳定的甲基碘化铋铵（MBI）（（CH 3 NH3）（3）Bi 2 I9）作为可溶液加工的光伏吸收剂产生六方非均匀形态，导致与电子和空穴传输层的界面接触差。在此，我们通过将少量的N-甲基-2-吡咯烷酮（NMP）作为形态控制剂引入MBI-DMF溶液中来调节MBI钙钛矿的形态。发现将各种浓度的NMP掺入到前体溶液中可以控制结晶速率。添加到MBI-DMF前体溶液中的2.5% NMP的最佳低浓度显示短路电流（J（sc））增加50%。该器件的功率转换效率高达0.31%，具有很高的可重复性。此外，当暴露于环境大气（相对湿度为50-60%）30天时，装置相当稳定。
Low toxicity and highly stable methylammonium bismuth iodide (MBI) ((CH3NH3)(3)Bi2I9) as a solution-processable photovoltaic absorber produces hexagonal non-uniform morphology leading to poor interfacial contacts with the electron and hole transporting layers. Herein, we tuned the morphology of MBI perovskite by bringing in a small amount of N-methyl-2-pyrrolidone (NMP) as a morphology controller into the MBI-DMF solution. The incorporation of various concentrations of NMP into the precursor solution was found to control the rate of crystallization. An optimal low concentration of 2.5% NMP added to the MBI-DMF precursor solution showed a 50% enhancement in short-circuit current (J(sc)). The device showed power conversion efficiencies up to 0.31% with high reproducibility. Moreover, the devices were quite stable when exposed to an ambient atmosphere (relative humidity of 50-60%) for 30 days.