Chemical Potential Diagram Guided Rational Tuning of Electrical Properties A Case Study of CsPbBr3 for X-ray Detection

Chemical Potential Diagram Guided Rational Tuning of Electrical Properties : A Case Study of CsPbBr3 for X-ray Detection

© 2022 Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 17 vom: 20. Apr., Seite e2110252
1. Verfasser: Du, Xinyuan (VerfasserIn)
Weitere Verfasser: Liu, Yingmeng, Pan, Weicheng, Pang, Jincong, Zhu, Jinsong, Zhao, Shan, Chen, Chao, Yu, Yu, Xiao, Zewen, Niu, Guangda, Tang, Jiang
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2022
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article X-ray detection chemical potential doping tunability intrinsic semiconductors metal halide perovskites
Beschreibung
Zusammenfassung:© 2022 Wiley-VCH GmbH.
Controlling the carrier polarity and concentration underlies most electronic and optoelectronic devices. However, for the intensively studied lead halide perovskites, the doping tunability is inefficient. In this work, taking CsPbBr3 as an example, it is revealed that the coexistence of metallic Pb or CsBr3 /Br2 , rather than the precursor ratio, can provide Pb-rich/Br-poor or Br-rich/Pb-poor chemical conditions, enabling the tunability of electrical properties from weak n-type, intrinsic, to moderate p-type. Experimentally, under Br2 -exposure treatment, a shift of the Fermi level as large as 1.00 eV is achieved, which is one of the highest value among all kinds of doping methods. The X-ray detector based on the intrinsic CsPbBr3 exhibits excellent performance, with a negligible dark-current drift of 7.1 × 10-4 nA cm-1 s-1 V-1 , a low detection limit of 103.6 nGyair s-1 , and a high sensitivity of 9085 μC Gyair -1 cm-2 . This work provides a critical understanding and guidance for tuning the electrical properties of lead halide perovskites, which establishes good foundations for achieving intrinsic perovskite semiconductors and also constructing potential homojunction devices
Beschreibung:Date Revised 27.04.2022
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202110252