Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 1, Pages 981-988Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c16047
Keywords
near-infrared photodetector; narrowband; perovskite; low band gap polymer; space charge
Funding
- Research Grants Council, University Grants Committee of Hong Kong Special Administrative Region, China
- General Research Fund [12302817, 12303920]
- Collaborative Research Fund [C5037-18GF]
- NSFC/RGC [N_HKBU201/19]
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The distinct visible-blind narrowband near-infrared (NIR) photo-detection behaviors in the perovskite/polymer hybrid photodetectors (PDs) have been investigated. The semiconducting perovskite layer acts as an internal NIR bandpass due to its high absorption to the visible light and high transparency to the NIR light. The hybrid PDs demonstrated have a -3 dB cutoff frequency of 300 kHz, providing an exciting option for a plethora of applications in bioimaging, environmental detection, and security monitoring.
The distinct visible-blind narrowband near-infrared (NIR) photo-detection behaviors in the perovskite/polymer hybrid photodetectors (PDs) have been investigated. The narrowband NIR response in the hybrid PDs is realized through the buildup of the space charges at the perovskite/polymer interface. The semiconducting perovskite layer acts as an internal NIR bandpass due to its high absorption to the visible light and high transparency to the NIR light. It also acts as an excellent hole-transporting layer, facilitating the efficient extraction of the holes generated in the low band gap NIR light-absorbing polymer blend layer. The hybrid PDs thus demonstrated have a -3 dB cutoff frequency of 300 kHz, providing an exciting option for a plethora of applications in bioimaging, environmental detection, and security monitoring.
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