@article{Kuang2026, 
author = {Shuan Kuang and Ziqiang Chen and Guanlin Huang and Mingquan Liao and Guangya Zheng and Yinsheng Xu and Tongle Bu and Guoqiang Luo and Xin He and Guangda Niu and Mengling Xia},
title = {A green-solvent strategy for uniform perovskite thick films in X-ray detection},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {4},
pages = {94908380},
keywords = {uniformity, X-ray detection, green solvent, perovskite polycrystalline films, ultrasonic-assisted annealing},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94908380},
doi = {10.26599/NR.2026.94908380},
abstract = {Perovskite polycrystalline films have gained considerable attention as promising materials for X-ray imaging applications. However, the conventional fabrication of perovskite-based X-ray detectors typically relies on large quantities of highly toxic solvents, especially since the absorber layer must reach thicknesses of hundreds of micrometers to ensure sufficient X-ray attenuation. To address this issue, we employed green and non-toxic γ-valerolactone (GVL) as the solvent for fabricating MAPbI3 perovskite thick films. Accompanying this, an ultrasonic-assisted annealing process was introduced to mitigate the irregular migration and inhomogeneous distribution of solute ions resulting from the weak coordination between GVL and Pb2+. This combined strategy enabled the production of MAPbI3 thick films with remarkable uniformity in both horizontal and vertical directions. The inhomogeneity values below 38.19% along the vertical axis and less than 6.6% in the horizontal plane were achieved, exhibiting an 84% improvement in dark current uniformity over films prepared by conventional annealing methods. Furthermore, the resulting MAPbI3 thick-film detector exhibits a high X-ray detection sensitivity and a high imaging resolution of 4.46 lp·mm−1. This work provides a robust and eco-friendly approach to the fabrication of high-performance and stable perovskite thick films for advanced radiation detectors.}
}