Solution‐Processable Methyl Ammonium Lead Iodide Single Crystal Photodetectors for Visible Light and X‐Ray

Abstract

A promising photodetector based on CH 3 NH 3 PbI 3 single crystal under visible light and X-ray irradiation is reported. The CH 3 NH 3 PbI 3 crystal grown by inverse temperature crystallization acts as the absorber material directly converting visible light and the impinging X-ray photons to electron hole pairs, respectively. The underlying photoelectric response mechanism behind the observation under visible light and X-ray irradiation is carefully discussed. Remarkably, the perovskite detectors demonstrate a good air-exposure stability for more than 2 months with encapsulation. The results demonstrate that the CH 3 NH 3 PbI 3 single crystal has a great potential for application in the visible light and X-ray detection.

Centimeter‐Sized Single Crystal of Two‐Dimensional Halide Perovskites Incorporating Straight‐Chain Symmetric Diammonium Ion for X‐Ray Detection

“…As shown in Table S2, the response speed of our device is among the fastest in all reported perovskite X-ray detectors. [9,[47][48][49] Importantly,both the photocurrent and dark current maintain their initial values without obvious degradation after about 6hours of continuous exposure to X-rays at ah igh 10 Vb ias (Figure 4f). This finding suggests aq uite stable photocurrent output, which is important for X-ray detection and imaging.A dditionally,t he BDAPbI 4 device exhibits as table baseline (dark current).…”

Inch-Size 0D-Structured Lead-Free Perovskite Single Crystals for Highly Sensitive Stable X-Ray Imaging

“…It is clear that MA 3 Bi 2 I 9 has the highest attenuation efficiency among all perovskites reported to date (Figure S9B). 2,11,12,39,40 Specifically, at a thickness of 300 mm, MA 3 Bi 2 I 9 SC attenuates 90.4% of the incident X-ray photons while Cs 2 AgBiBr 6 attenuates 87.7%, MAPbI 3 attenuates 89.5%, MAPbBr 3 attenuates 68.9%, MAPbCl 3 attenuates 56.8%, a-Se attenuates 64.6%, and Si attenuates only 4.8%. Charge collection also plays an important role in X-ray detection and is decided by the mt product.…”

Triple‐Cation and Mixed‐Halide Perovskite Single Crystal for High‐Performance X‐ray Imaging

“…They are advantageous in strong X‐ray absorption, processable at low temperature, low‐cost fabrication, and superior semiconducting properties like low defect density, large mobility–lifetime product ( μτ ), long carrier diffusion length, etc. Noticeably, the recently reported X‐ray detectors based on 3D perovskites including MAPbI 3 [ 4,10–12 ] and CsFAMA [ 13 ] microcrystalline thin films or MAPbX 3 (X = Cl, Br, I and their mixture), [ 14–24 ] Cs x FA 1− x PbI 3 , [ 25 ] CsPbBr 3 , [ 26–29 ] and Cs 2 AgBiBr 6 [ 30–32 ] single crystals have realized high sensitivity with the highest up to 2.1 × 10 4 µC Gy air –1 cm –2 , significantly larger than the state‐of‐the‐art α‐Se X‐ray detectors. [ 33 ]…”