期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 39, 页码 26013-26018出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b07837
关键词
organolead halide perovskite; CH3NH3PbI3; solar cells; CW-IR laser deposition; codeposition; PID control; hysteresis
资金
- Japan Science and Technology Agency (JST) through program for Precursory Research for Embryonic Science and Technology (PRESTO)
Organolead-halide perovskites can be promising materials for next-generation solar cells because of its high power conversion efficiency. The method of precise fabrication is required because both solution-process and vacuum-process fabrication of the perovskite have problems of controllability and reproducibility. Vacuum deposition process was expected to achieve precise control; however, vaporization of amine compound significantly degrades the controllability of deposition rate. Here we achieved the reduction of the vaporization by implementing the laser evaporation system for the codeposition of perovskite. Locally irradiated continuous-wave lasers on the source materials realized the reduced vaporization of CH3NH3I. The deposition rate was stabilized for several hours by adjusting the duty ratio of modulated laser based on proportional-integral control. Organic-photovoltaic-type perovskite solar cells were fabricated by codeposition of PbI2 and CH3NH3I. A power-conversion efficiency of 16.0% with reduced hysteresis was achieved.
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