期刊
ADVANCED OPTICAL MATERIALS
卷 8, 期 23, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202001436
关键词
atomic layer deposition; high‐ sensitivity photodetectors; inorganic perovskites; 2D barcode scanning; weak‐ light imaging
资金
- National Natural Science Foundation of China [61604061, 52002147, 51772135]
- Natural Science Foundation of Guangdong Province, China [2017A020215135, 2018A030310659, 2019A1515010482, 2020A1515011377]
- Fundamental Research Funds for the Central Universities [11618405, 21618311]
- Young Innovative Talent Project of General Colleges and Universities in Guangdong Province [2018KQNCX007]
- Science and Technology Program of Guangzhou, China [201804010432]
Linear dynamic range (LDR) and weak-light detection limit of photodetectors (PDs) directly determine the imaging resolution and signal-to-noise ratio (SNR) in weak-light condition. Herein, an all-inorganic perovskite PD is designed with a sandwich structure of NiOx/CsPbBr3/TiO2 (NCT). The CsPbBr3 perovskites are designed by a spin-coating method, and NiOx and TiO2 layers are introduced by an atomic layer deposition (ALD) method. The optimized NCT PD exhibits outstanding performance with ultralow dark current (approximate to 10(-11) A), broad LDR (186.7 dB), and ultralow detection limit (857 pW cm(-2)). Significantly, a proof-of-concept optical imaging system has been demonstrated using the NCT PD as the sensor element, which shows high resolution and high SNR even under weak-light condition. Furthermore, as a demo application, a solution is provided to the identification problem of 2D barcode under a weak-light environment as low as 4 nW cm(-2). The results show promising applications of the all-inorganic perovskite PD serving as a weak-light imaging sensor, with unique potential for low-cost manufacturing of large-area optoelectronic devices.
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