In Situ Ionic Liquid Oligomer Encapsulation Enabled Robust Perovskite Single Crystals toward High-Efficiency X-ray Detection

TY - JOUR

T1 - In Situ Ionic Liquid Oligomer Encapsulation Enabled Robust Perovskite Single Crystals toward High-Efficiency X-ray Detection

AU - Li, Liangji

AU - Gao, Aijing

AU - Sun, Chen

AU - Wu, Xuhui

AU - Wang, Xiaoning

AU - Zhou, Yubin

AU - Sun, Jian

AU - Zhong, Haizheng

AU - Chen, Yu

N1 - Publisher Copyright: © 2026 American Chemical Society

PY - 2026/3/13

Y1 - 2026/3/13

N2 - Because of the susceptibility of perovskite single crystals (PerSCs) to moisture- and oxygen-induced degradation, the simultaneous improvement of their environmental durability and optoelectronic properties remains an intractable challenge. Herein, we develop an in situ encapsulation approach for PerSCs using a polymerizable ionic liquid, named 1-vinyl-3-butylimidazolium bis(trifluoromethylsulfonyl)imide (Bvim-TFSI), as an additive. Bvim-TFSI addition can facilitate the thermokinetic growth process and eliminate the need for intricate post-treatments owing to its self-cleaning property. More importantly, the in situ radical polymerization of Bvim-TFSI on the crystal surface leads to the formation of an oligomeric encapsulation layer, imparting an enhanced environmental robustness to the as-fabricated PerSC, with no observable degradation after 10 months of air exposure. The resulting MAPbI3 single crystal exhibits an X-ray detection sensitivity of 1.80 × 105 μC Gyair–1 cm–2 with a low limit of detection of 10.37 nGyair s–1. Moreover, the PerSC-based device demonstrates nearly 100% performance retention after 30 days of storage in ambient air without additional protection. This study provides a facile route for the fabrication of high-quality and durable PerSCs toward optoelectronic applications.

AB - Because of the susceptibility of perovskite single crystals (PerSCs) to moisture- and oxygen-induced degradation, the simultaneous improvement of their environmental durability and optoelectronic properties remains an intractable challenge. Herein, we develop an in situ encapsulation approach for PerSCs using a polymerizable ionic liquid, named 1-vinyl-3-butylimidazolium bis(trifluoromethylsulfonyl)imide (Bvim-TFSI), as an additive. Bvim-TFSI addition can facilitate the thermokinetic growth process and eliminate the need for intricate post-treatments owing to its self-cleaning property. More importantly, the in situ radical polymerization of Bvim-TFSI on the crystal surface leads to the formation of an oligomeric encapsulation layer, imparting an enhanced environmental robustness to the as-fabricated PerSC, with no observable degradation after 10 months of air exposure. The resulting MAPbI3 single crystal exhibits an X-ray detection sensitivity of 1.80 × 105 μC Gyair–1 cm–2 with a low limit of detection of 10.37 nGyair s–1. Moreover, the PerSC-based device demonstrates nearly 100% performance retention after 30 days of storage in ambient air without additional protection. This study provides a facile route for the fabrication of high-quality and durable PerSCs toward optoelectronic applications.

UR - https://www.scopus.com/pages/publications/105032754661

U2 - 10.1021/acsenergylett.6c00267

DO - 10.1021/acsenergylett.6c00267

M3 - Article

AN - SCOPUS:105032754661

SN - 2380-8195

VL - 11

SP - 2993

EP - 3002

JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 3

ER -