Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 10, Issue 9, Pages 3538-3546Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc05538k
Keywords
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Funding
- National Natural Science Foundation of China [61804113, 61874083, 62004151]
- Initiative Postdocs Supporting Program [BX20190261]
- China Postdoctoral Science Foundation [2019M663628]
- National Natural Science Foundation of Shaanxi Province [2018ZDCXL-GY-08-02-02, 2017JM6049]
- Department of Science & Technology of Shaanxi Province [2020GXLH-Z-014]
- Northwestern Polytechnical University [2020GXLH-Z-014]
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In this study, Cs2PbI2Cl2 nanowires were grown onto a PbI2 film using an in situ, seed-free solution method, forming a Cs2PbI2Cl2 nanowires/PbI2 heterojunction. This heterojunction was used to fabricate a self-powered photodetector with superior performance in terms of responsivity, detectivity, and response speed.
As the necessary precursor of emerging lead-halide perovskite materials, PbI2 is also promising for optoelectronic devices, such as photodetectors (PDs). Herein, the novel Ruddlesden-Popper (RP) perovskite Cs2PbI2Cl2 nanowires are grown onto PbI2 film by an in situ, seed-free solution method to build a Cs2PbI2Cl2 nanowires/PbI2 heterojunction, wherein the stress-induced diffusion mechanism is proposed for its formation. Furthermore, the heterojunction is used to fabricate the low-cost, simple-structure self-powered PD, which exhibits a responsivity (R) peak of 0.17 A W-1, a specific detectivity (D*) maximum of 3.02 x 10(12) Jones, and a fast response speed of 0.95 mu s. These performance parameters are much better than those of a similar PD based on the pristine PbI2 film and even superior to most of PbI2-based PDs reported earlier. The greatly improved performance of the self-powered PD with the Cs2PbI2Cl2 nanowires/PbI2 heterojunction is largely related to the suppressed carrier recombination and enhanced carrier transportation, as a result of the enlarged built-in field (E-b) by the heterojunction. Hence, our work provides a scientific basis for exploiting high-performance PDs by combining PbI2 with novel perovskite materials.
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