High-Energy Photon Spectroscopy Using All Solution-Processed Heterojunctioned Surface-Modified Perovskite Single Crystals

Abstract

Organic−inorganic hybrid perovskites have been intensively studied for their use in optoelectronic devices due to their utilization of lowcost, earth-abundant precursors that are solution-processed at low-temperatures into high-quality devices. Despite this progress, interdevice variability and long-term stability have prevented the widespread commercial adoption of perovskite devices, especially for high-energy photon detectors. Using methylammonium lead iodide perovskite single crystals grown via inversetemperature crystallization, we demonstrate a facile solution-based technique to coat the single-crystalline bulk with a micrometer-scale thick surface layer comprised of a wider band gap two-dimensional Ruddlesden−Popper (RP) hybrid perovskite. The resulting perovskite room-temperature γ-ray detector devices exhibit greatly improved device yield and repeatability from run-to-run and device-to-device within a given processing run. With an energy resolution of under 15% (12.0 keV) for incident 81 keV photons, this solution-based technique resolves interdevice variability concerns and could pave the way for low-cost, scalable manufacturing of optoelectronic devices based on RP hybrid perovskite films.

Conformational disorder of organic cations tunes the charge carrier mobility in two-dimensional organic-inorganic perovskites

“…4 ). M–G analysis of I–V data has been used to estimate the carrier mobility (Supplementary Note 4 ) 18 , 42 . The pictures of real devices based on six 2D OIHPs have been shown in Supplementary Fig.…”

Origin of High Efficiency and Long-Term Stability in Ionic Liquid Perovskite Photovoltaic

“…The reduction of defects and the suppression of ion migration are attributed to the passivation of GBs by residual MAAc in the film. Perovskite crystals with low defects and suppressed ion migration are beneficial for long-term stability of films and devices [ 40 – 42 ].…”

Recent Progress in Halide Perovskite Radiation Detectors for Gamma-Ray Spectroscopy

“…These 2D perovskites, with general chemical formula (RNH 3 ) 2 ­A n ‑1 ­BX 3 n +1 , are more environmentally stable due to the existence of a protecting organic spacer made of RNH 3 molecules (either aliphatic or aromatic alkyl­ammonium cations), and thus have great potential for the fabrication of long-term stable photovoltaic devices and photodetectors. − Pure 2D RP perovskites thin films have been demonstrated in high sensitivity and robust thin-film X-ray detectors . Recently, Joglekar et al showed improved γ-ray detection performance by coating the surface of MAPbI 3 single crystals with a 2D RP perovskite . A 2–3 μm thick 2D RP perovskite film was deposited on the surface of solution-grown MAPbI 3 single crystals through a solution-based alkyl­amine treatment.…”