| Summary: | 碩士 === 國立清華大學 === 化學工程學系所 === 106 === The organic-inorganic hybrid perovskites have been receiving considerable attention in various optoelectronic applications due to its superior characteristics including high absorption coefficient, direct bandgap, long carrier lifetime, and high hole and electron mobility. However, current perovskite solar cells are all based on polycrystalline perovskite thin films, which contain plenty of grain boundaries and surface defects, rendering noticeable carrier loss and device instability. It was reported that single crystalline perovskite possesses superior optoelectronic properties and stability due to less grain boundaries and surface defects.
However, the widely explored MAPbI3 is still unstable due to its distorted crystal structure caused by small MA+ ions. It was found that the crystal structure is weak against moisture. Herein we added formamidinium ions (FA+) ions in the MA+ incubation solution and successfully synthesized MAXFA(1-X)PbI3 single crystal by means of inverse temperature crystallization. We examined the mixed cation single crystals by several instruments and found they possess better stability under high humidity.
In addition, the applications on MSCs are limited by the thickness of crystals. Herein, we designed a incubating tank to synthesize large area MAPbI3 wafer with 0.17mm in thickness. We also synthesized MAXFA(1-X)PbI3 wafer and measured its electrical properties comparing to MAPbI3.
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