High Spectral‐Rejection‐Ratio Narrowband Photodetectors Based on Perovskite Heterojunctions. (10th June 2022)

• Record Type: Journal Article
• Authors: Wang, Xin; Pan, Yuzhu; Xu, Yubing; Zhao, Jingda; Li, Yuwei; Li, Qing; Chen, Jing; Zhao, Zhiwei; Zhang, Xiaobing; Elemike, Elias E.; Onwudiwe, Damian C.; Bae, Byung Seong; Lei, Wei
• Is Part Of: Advanced Electronic Materials. Volume 8:Number 9(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-10
• Subjects: high spectral rejection ratio -- low background noise -- narrowband photodetection -- perovskite heterojunctions; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.202200178
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract: Narrowband photodetection provides important information in a specific wavelength range. Specially, the use of nonoptical‐filter narrowband photodetectors based on MAPbX3 (MA = CH3 NH3 ; X = Cl, Br, I) perovskites is reported of great potential. However, current MAPbX3 ‐based narrowband photodetectors have to sacrifice their photocurrent and response speed to achieve an acceptable spectral rejection ratio. In this work, a new type of heterojunction photodetector (hetero‐PD) with a structure of (n‐type doped MAPbCl3 )/(intrinsic MAPbBr2.5 Cl0.5 )/(n‐type doped MAPbBr3 ) via epitaxial growth is demonstrated as a narrowband photodetector. Through optical bandgap engineering, photons with different wavelength can be absorbed in different layers. Owing to the n–i–n energy band structure, most external bias would apply on a tiny region near the n–i heterojunction. Besides, the energy barriers in the heterojunctions can block holes from injection and collection, resulting in low‐noise electron‐only hetero‐PDs. By sufficiently suppressing the background noise from short‐wavelength photons, hetero‐PDs are capable of achieving a high spectral rejection ratio of 98.1% under an electrical field of 8 V cm −1 . Moreover, hetero‐PDs exhibit a high external quantum efficiency value of 45%, a narrow full width at half‐maximum of 13 nm, and a response time of 1.35 µs. Abstract : This work provides a new structure of n‐type/intrinsic/n‐type. Through optical bandgap and electronic band structure engineering, high spectral‐rejection‐ratio narrowband photodetection is realized.