Out‐Of‐Phase Articulation Strategy of CsPbBr<sub>3</sub>/CsPb<sub>2</sub>Br<sub>5</sub> Perovskite for High Sensitivity X‐Ray Detection
Changmao Wan, Zihan Wang, Hui Zhang, Shujie Tie, Zheng Liang, Huifen Xu, Yuanbo Ma, Zhenyu Wang, Xiaojia Zheng, Xu Pan, Jiajiu Ye
Abstract
Abstract Polycrystalline CsPbBr 3 perovskite materials exhibit exemplary stability, and desirable optoelectronic characteristics are promising for direct X‐ray detection. In this study, polycrystalline 2D phase of CsPb 2 Br 5 hinged on CsPbBr 3 is investigated for X‐ray array detector. The incorporation of CsPb 2 Br 5 will modify the carrier transport environment, acting as an amplification factor that significantly enhances carrier mobility and response sensitivity. Finally, the devices demonstrates excellent performance growth. Carrier mobility of CsPbBr 3 is improved by a significant 2 orders of magnitude, leading to the sensitivity increased from 2.64 × 10 4 to 2.58 × 10 5 µC Gy air −1 cm −2 at a bias voltage of 25 V mm −1 . Even at a low bias voltage of 2 V mm −1 , still got the value of 3.075 × 10 3 µC Gy air −1 cm −2 , accompanied by a notable increase in the minimum detection limit of 127.9 nGy air s −1 at 0.5 V. Furthermore, a high modulation transfer function (MTF) of 1.57 lp mm −1 is obtained, and achieved a clear and high contrast X‐ray imaging with 64 × 64 TFT board. The perovskite exhibits outstanding light stability (RH ≈ 70 ± 5%) in the atmosphere following the introduction of 2D phase. This excellent carrier transport effect and good long‐term stability present significant commercial potential.