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Cs 2 AgInCl 6 Double Perovskite Single Crystals: Parity Forbidden Transitions and Their Application For Sensitive and Fast UV Photodetectors

2017; American Chemical Society; Volume: 5; Issue: 2 Linguagem: Inglês

10.1021/acsphotonics.7b00837

2330-4022

Jiajun Luo, Shunran Li, Haodi Wu, Ying Zhou, Li Yang, Jing Liu, Jinghui Li, Kanghua Li, Fei Yi, Guangda Niu, Jiang Tang,

Optical properties and cooling technologies in crystalline materials

Double perovskite Cs2AgInCl6 is newly reported as a stable and environmentally friendly alternative to lead halide perovskites. However, the fundamental properties of this material remain unexplored. Here, we first produced high-quality Cs2AgInCl6 single crystals (SCs) with a low trap density of 8.6 × 108 cm–3, even lower than the value reported in the best lead halide perovskite SCs. Through systematical optical and electronic characterization, we experimentally verified the existence of the proposed parity-forbidden transition in Cs2AgInCl6 and identified the role of oxygen in controlling its optical properties. Furthermore, sensitive (dectivity of ∼1012 Jones), fast (3 dB bandwidth of 1035 Hz), and stable UV photodetectors were fabricated based on our Cs2AgInCl6 SCs, showcasing their advantages for optoelectronic applications.