Pressure Dependence of Mixed Conduction and Photo Responsiveness in Organolead Tribromide Perovskites.
Pressure Dependence of Mixed Conduction and Photo Responsiveness in Organolead Tribromide Perovskites.
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DOI：
10.1021/acs.jpclett.7b01022
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
Huacai Yan;Tianji Ou;Hui Jiao;Tianyi Wang;Qinglin Wang;Cailong Liu;Xizhe Liu;Yonghao Han;
中科院分区：
文献类型：
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作者：
Huacai Yan;Tianji Ou;Hui Jiao;Tianyi Wang;Qinglin Wang;Cailong Liu;Xizhe Liu;Yonghao Han;
采用交流阻抗谱技术原位研究了CH 3 NH3 PbBr 3（MAPbBr 3）多晶在5.6GPa高压下的电输运性质。证实了MAPbBr 3中离子导电和电子导电共存。当压力低于3.3GPa时，离子迁移是主要过程，而压力高于3.3GPa时，电子传导成为主要过程。可以观察到明显的离子-电子跃迁。MAPbBr 3的压力依赖性的光响应性进行了研究，通过原位光电流测量高达3.8 GPa。在光电流测量中可以清楚地看到混合导电。此外，光电流保持稳健低于2.4 GPa，而它们被抑制与压力诱导的部分非晶化。有趣的是，MAPbBr 3的光电响应可以通过高压增强，并且最强的光电流值出现在0.7 GPa的高压阶段II，这与MAPbI 3和MASnI 3的先前结果相似。
The electrical transport properties of CH3NH3PbBr3 (MAPbBr3) polycrystals were in situ investigated by alternating-current impedance spectroscopy under high pressures up to 5.6 GPa. It is confirmed that ionic and electronic conductions coexist in MAPbBr3. As pressure below 3.3 GPa ions migration is the predominant process, while above 3.3 GPa electronic conduction becomes the main process. An obvious ionic-electronic transition can be observed. The pressure dependent photo responsiveness of MAPbBr3 was also studied by in situ photocurrent measurements up to 3.8 GPa. The mixed conduction can be clearly seen in photocurrent measurement. Additionally, the photocurrents remain robust below 2.4 GPa, while they are suppressed with pressure-induced partial amorphization. Interestingly, the photoelectric response of MAPbBr3 can be enhanced by high pressure, and the strongest photocurrent value appears in the high-pressure phase II at 0.7 GPa, which is similar to previous results in both MAPbI3 and MASnI3.