Millimeter-Sized Single-Crystal CsPbrB₃/CuI Heterojunction for High-Performance Self-Powered Photodetector

Abstract

Millimeter-sized CsPbBr3 single crystals were prepared via a facile solvent-evaporation method in ambient environment. The heterojunction between p-type CuI and n-type CsPbBr3 was formed by a simple immersion process. The as-integrated CsPbBr3/CuI device exhibits a good rectifying behavior (ratio of 250 at ±2 V). In particular, the photodetector shows excellent self-powered characteristics under 540 nm light illumination, including high photocurrent (near 100 nA); high photosensitivity (on/off ratio of 1.5 × 103); fast response speed (0.04/2.96 ms); and good wavelength selectivity (565–525 nm), responsivity (1.4 mA W–1), and detectivity (6.2 × 1010 Jones). This work provides a simple, low-cost, and effective method for preparing millimeter-level CsPbBr3 single crystals. The simple device architecture further provides a promising approach for fabricating high-performance self-powered photodetectors.

Recent Progress of Heterojunction Ultraviolet Photodetectors: Materials, Integrations, and Applications

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Solution‐Processed Transparent Sn4+‐Doped CuI Hybrid Photodetectors with Enhanced Performances

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Tunable self‐powered n‐SrTiO3 photodetectors based on varying CuS‐ZnS nanocomposite film (p‐CuZnS, p‐CuS, and n‐ZnS)

“…P‐n junction‐based detectors have the advantages of wide linear range, fast response speed, low noise, and good photoelectric performance . Significant progresses in p‐n type photodetectors have been achieved with self‐powered behaviors or enhanced performance . However, it is still extremely important to fabricate self‐powered photodetectors with tailorable properties, and exploring their in‐depth mechanism for practical applications.…”

“…[13][14][15][16][17] Significant progresses in p-n type photodetectors have been achieved with self-powered behaviors or enhanced performance. [18][19][20][21][22][23] However, it is still extremely important to fabricate self-powered photodetectors with tailorable properties, and exploring their in-depth mechanism for practical applications.…”