Issue 47, 2023

Realizing low-ion-migration and highly sensitive X-ray detection by building g-C3N4 and CH3NH3PbI3 bulk heterojunction pellets

Abstract

Three-electronic-dimensional (3D) lead halide perovskites show high X-ray sensitivities and a low limit of detection. However, servere ion migration causes dark current drift and worsens long-term operational stability. Although two-electronic-dimensional (2D) perovskite and 3D perovskite heterojunction devices have been shown to reduce ion migration, their current responses to X-rays have decreased considerably. A device with low ion migration without sacrificing X-ray sensitivity is needed. Atomic-thick two-dimensional (2D) materials with small pore sizes between atoms and high carrier-tunneling possibilities through them are reasonable candidates to simultaneously block ion migration and retain carrier–transport properties. Herein, a 2D monolayer of g-C3N4 was introduced into a CH3NH3PbI3 (MAPbI3) polycrystalline pellet through hot pressing. The small-sized tri-s-triazine structure of g-C3N4 could inhibit ion migration without affecting the electron transport of the perovskite pellet. As a result, the g-C3N4/MAPbI3 heterojunction pellet exhibited an ultra-low current drift of 4.87 × 10−5 nA cm−1 s−1 V−1 at an electric field of 12.66 V mm−1. Simultaneously, the detector exhibited a high sensitivity of 1.78 × 105 μC Gyair−1 cm−2 under 75.95 V mm−1 and a low limit of detection of 27 nGyair s−1 under 12.66 V mm−1, which are among the best of reported results. This work provides an effective design strategy to develop X-ray detectors with low ion migration and high detection performance.

Graphical abstract: Realizing low-ion-migration and highly sensitive X-ray detection by building g-C3N4 and CH3NH3PbI3 bulk heterojunction pellets

Supplementary files

Article information

Article type
Paper
Submitted
12 9 2023
Accepted
10 11 2023
First published
10 11 2023

J. Mater. Chem. A, 2023,11, 25918-25928

Realizing low-ion-migration and highly sensitive X-ray detection by building g-C3N4 and CH3NH3PbI3 bulk heterojunction pellets

C. Xue, Y. Xiao, X. Liu, Z. Xu, N. Li, S. Wang, N. Yuan, J. Ding, X. Guo, Z. Yang and S. (. Liu, J. Mater. Chem. A, 2023, 11, 25918 DOI: 10.1039/D3TA05555H

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