Zhang Jingtian, Guo Wuqian, Xu Haojie, Fan Qingshun, Sun Zhihua, Luo Junhua
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, P. R. China.
Chemistry. 2025 Mar 3;31(13):e202403840. doi: 10.1002/chem.202403840. Epub 2025 Feb 10.
Lead-free bismuth halogen perovskites have emerged as a promising candidate for high-performance X-ray detection, owing to their unique properties of bulk resistivity, significant X-ray absorption capabilities and diminished ion migration. Herein, using the facile low-temperature solution method, we obtained a large-size single crystal of (guanidinium)BiBr (GBB), which adopts a zero-dimensional (0D) inorganic perovskite-like framework. The as-grown crystals show high resistivity (3.51×10 Ω cm), low trap density (1.14×10 cm) and large carrier mobility-lifetime product (μτ=1.13×10 cm V) under X-ray irradiation. Strikingly, the X-ray detectors fabricated on GBB single crystals exhibit notable performances including low dark current drift, high sensitivity of ~1645.7 μC Gy cm, and ultralow detection limit of ~0.85 nGy s. This detection limit is among the lowest level for the reported 0D perovskite X-ray detectors. This study illuminates the prospective research into novel lead-free hybrid perovskites for the advancement of high-performance detectors of irradiation.
无铅铋卤化物钙钛矿因其具有体电阻率独特、X射线吸收能力强和离子迁移减少等特性，已成为高性能X射线探测的一个有前景的候选材料。在此，我们采用简便的低温溶液法获得了大尺寸的（胍鎓）溴化铋（GBB）单晶，其采用零维（0D）无机类钙钛矿框架。生长出的晶体在X射线照射下显示出高电阻率（3.51×10 Ω·cm）、低陷阱密度（1.14×10 cm）和大的载流子迁移率-寿命积（μτ=1.13×10 cm² V⁻¹）。引人注目的是，基于GBB单晶制造的X射线探测器表现出显著的性能，包括低暗电流漂移、1645.7 μC Gy⁻¹ cm⁻²的高灵敏度和约0.85 nGy s⁻¹的超低检测限。该检测限处于已报道的0D钙钛矿X射线探测器的最低水平之列。这项研究为新型无铅杂化钙钛矿在高性能辐射探测器方面的前瞻性研究提供了启示。
