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Bulk Heterostructure BA2PbI4/MAPbI3 Perovskites for Suppressed Ion Migration To Achieve Sensitive X-ray Detection Performance
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-11-30 , DOI: 10.1021/acsami.2c17715 Yingrui Xiao 1 , Chengzhi Xue 1 , Xi Wang 1 , Yucheng Liu 1 , Zhou Yang 1 , Shengzhong Liu 1, 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-11-30 , DOI: 10.1021/acsami.2c17715 Yingrui Xiao 1 , Chengzhi Xue 1 , Xi Wang 1 , Yucheng Liu 1 , Zhou Yang 1 , Shengzhong Liu 1, 2
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Three-dimensional (3D) lead–halide perovskites with outstanding mobility-lifetime products and large attenuation coefficients for X-ray photons have demonstrated highly sensitive X-ray detection. However, there exists severe ion migration, especially under electrical bias, that results in dark-current drift and poorer device stability. Theoretical analyses suggest that 3D perovskites with two-dimensional (2D) perovskites may mitigate ion migration and reduce the dark current to achieve a drastically lower detection limit, which is badly needed for X-ray diagnostics. A bulk 2D/3D perovskite heterostructure is therefore designed and prepared by hot-pressing a mixture of BA2PbI4 and MAPbI3 particles. Compared with the pure MAPbI3 pellet, the bulk 2D/3D heterostructure pellet shows much higher resistivity, hence, significantly reduced ion migration and a much smaller dark-current drift of 4.84 × 10–5 nA cm–1 s–1 V–1, which is much lower than that of the pristine MAPbI3 pellet, thus demonstrating its effectiveness for the suppression of ion migration. The bulk 2D/3D heterostructure pellet attains an X-ray sensitivity of 2.0 × 103 μC Gyair–1 cm–2 as well as a lower detection limit of 111.76 nGy s–1 under 10 V bias. This work provides a successful strategy to prepare X-ray detectors with suppressed ion migration and negligible dark current drift, which will further benefit the development of lead–halide perovskite X-ray detectors.
中文翻译：
块状异质结构 BA2PbI4/MAPbI3 钙钛矿用于抑制离子迁移以实现灵敏的 X 射线检测性能
三维 (3D) 卤化铅钙钛矿具有出色的迁移率-寿命产品和 X 射线光子的大衰减系数，已证明具有高灵敏度的 X 射线检测。然而，存在严重的离子迁移，特别是在电偏压下，这会导致暗电流漂移和较差的器件稳定性。理论分析表明，具有二维 (2D) 钙钛矿的 3D 钙钛矿可以减轻离子迁移并减少暗电流，从而实现显着降低的检测限，这对于 X 射线诊断来说是非常需要的。因此，通过热压 BA 2 PbI 4和 MAPbI 3颗粒的混合物来设计和制备块体 2D/3D 钙钛矿异质结构。与纯 MAPbI 3相比颗粒，大块 2D/3D 异质结构颗粒显示出更高的电阻率，因此，离子迁移显着减少，暗电流漂移小得多，为 4.84 × 10 –5 nA cm –1 s –1 V –1，远低于原始 MAPbI 3颗粒，从而证明其抑制离子迁移的有效性。块状 2D/3D 异质结构颗粒的 X 射线灵敏度为 2.0 × 10 3 μC Gy air –1 cm –2，检测下限为 111.76 nGy s –1在 10 V 偏压下。这项工作提供了一种成功的策略来制备具有抑制离子迁移和可忽略的暗电流漂移的X射线探测器，这将进一步有利于卤化铅钙钛矿X射线探测器的发展。
更新日期：2022-11-30
中文翻译：
块状异质结构 BA2PbI4/MAPbI3 钙钛矿用于抑制离子迁移以实现灵敏的 X 射线检测性能
三维 (3D) 卤化铅钙钛矿具有出色的迁移率-寿命产品和 X 射线光子的大衰减系数，已证明具有高灵敏度的 X 射线检测。然而，存在严重的离子迁移，特别是在电偏压下，这会导致暗电流漂移和较差的器件稳定性。理论分析表明，具有二维 (2D) 钙钛矿的 3D 钙钛矿可以减轻离子迁移并减少暗电流，从而实现显着降低的检测限，这对于 X 射线诊断来说是非常需要的。因此，通过热压 BA 2 PbI 4和 MAPbI 3颗粒的混合物来设计和制备块体 2D/3D 钙钛矿异质结构。与纯 MAPbI 3相比颗粒，大块 2D/3D 异质结构颗粒显示出更高的电阻率，因此，离子迁移显着减少，暗电流漂移小得多，为 4.84 × 10 –5 nA cm –1 s –1 V –1，远低于原始 MAPbI 3颗粒，从而证明其抑制离子迁移的有效性。块状 2D/3D 异质结构颗粒的 X 射线灵敏度为 2.0 × 10 3 μC Gy air –1 cm –2，检测下限为 111.76 nGy s –1在 10 V 偏压下。这项工作提供了一种成功的策略来制备具有抑制离子迁移和可忽略的暗电流漂移的X射线探测器，这将进一步有利于卤化铅钙钛矿X射线探测器的发展。
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