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Ultrasensitive Photodetectors Based on Island-Structured CH3NH3PbI3 Thin Films

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journal contribution
posted on 07.10.2015, 00:00 by Yin Zhang, Juan Du, Xiaohan Wu, Guoqian Zhang, Yingli Chu, Dapeng Liu, Yixin Zhao, Ziqi Liang, Jia Huang
CH3NH3PbI3 perovskite-based optoelectronics have attracted intense research interests recently because of their easy fabrication process and high power conversion efficiency. Herein, we report a novel photodetector based on unique CH3NH3PbI3 perovskite films with island-structured morphology. The light-induced electronic properties of the photodetectors were investigated and compared to those devices based on conventional compact CH3NH3PbI3 films. The island-structured CH3NH3PbI3 photodetectors exhibited a rapid response speed (<50 ms), good stability at a temperature of up to 100 °C, a large photocurrent to dark current ratio (Ilight/Idark > 1 × 104 under an incident light of ∼6.59 mW/cm2, and Ilight/Idark > 1 × 102 under low incident light ∼0.018 mW/cm2), and excellent reproducibility. Especially, the performance of the island-structured devices markedly exceed that of the conventional compact CH3NH3PbI3 thin-film devices. These excellent performances render the island-structured device to be potentially applicable for a wide range of optoelectronics.