1. Ultrahigh Responsivity and Detectivity Graphene–Perovskite Hybrid Phototransistors by Sequential Vapor Deposition
- Author
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Yi-Chen Tsai, Chih-I Wu, Ang-Sheng Chou, Kuo-You Huang, Yu-Bing Lan, Tsung-Chin Cheng, Chia-Shuo Li, Po-Han Chang, Shang-Yi Liu, Xue-Qian You, and Juen-Kai Wang
- Subjects
chemistry.chemical_classification ,Quenching ,Multidisciplinary ,Materials science ,Photoluminescence ,business.industry ,Graphene ,Exciton ,Iodide ,02 engineering and technology ,Chemical vapor deposition ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Article ,0104 chemical sciences ,law.invention ,Responsivity ,chemistry ,law ,Optoelectronics ,0210 nano-technology ,business ,Perovskite (structure) - Abstract
In this work, graphene-methylammonium lead iodide (MAPbI3) perovskite hybrid phototransistors fabricated by sequential vapor deposition are demonstrated. Ultrahigh responsivity of 1.73 × 107 A W−1 and detectivity of 2 × 1015 Jones are achieved, with extremely high effective quantum efficiencies of about 108% in the visible range (450–700 nm). This excellent performance is attributed to the ultra-flat perovskite films grown by vapor deposition on the graphene sheets. The hybrid structure of graphene covered with uniform perovskite has high exciton separation ability under light exposure, and thus efficiently generates photocurrents. This paper presents photoluminescence (PL) images along with statistical analysis used to study the photo-induced exciton behavior. Both uniform and dramatic PL intensity quenching has been observed over entire measured regions, consistently demonstrating excellent exciton separation in the devices.
- Published
- 2017
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