Search

Recently, lead halide perovskites arouse intensive attentions in photoelectric fields owing to their low trap state density, high carrier mobility, large extinction coefficient, and low‐temperature solution processing technique. However, their future commercial development is severely hampered by the lead toxicity and instability. Although lead‐free metal‐halide perovskites recently have been extensively studied in optoelectronics, their low‐dimensional counterparts can further expand their novel optical and electronic properties for potential applications. In this work, the planar growth of one‐dimensional (1D) CsAg2I3 single‐crystal microwires (MWs) on diverse substrates by space‐confined method is reported. The growth kinetic process of CsAg2I3 single‐crystal MWs is elucidated by in situ observation. Furthermore, the CsAg2I3 single‐crystal MWs exhibit potential applications in ultraviolet light photodetectors as a photoactive layer. The fabricated heterojunction photodetector exhibits pronounced photoelectric performances working in self‐powered mode, including a specific detectivity of 2.09 × 108 Jones, a high responsivity of 26.5 mA W−1, and fast response speed of 258.43/289.32 ms under light illumination of 265 nm, due to the high crystallinity and effective photogenerated carrier transfer. This study provides a vital insight into the rational design of low‐dimensional perovskites for versatile optoelectronic applications. [ABSTRACT FROM AUTHOR]

X‐ray detectors are used widely, but they suffer from short operational stability and insufficient absorptivity of X‐ray photons. Here, a strategy for room‐temperature, solution‐grown δ‐CsPbI3 monocrystalline microwires exhibiting one of the highest linear X‐ray absorption coefficients among known semiconductors is reported. In a metal–semiconductor–metal architecture, δ‐CsPbI3 demonstrates one of the lowest detectable X‐ray dose rates at 33.3 nGyair s−1, enabled by its exceptionally low dark current density of 12 pA mm−2. The detector remains stable following a continuous operation for a total accumulated dose of 1.44 × 106 Gyair, which is equivalent to 720 million chest X‐ray scans. The 1D crystalline nature of δ‐CsPbI3 enables a high X‐ray imaging resolution of 12.4 line pairs per millimeter (lp mm−1). [ABSTRACT FROM AUTHOR]

1D metal halide perovskites (MHPs) are known as excellent candidates for fabricating high‐performance optoelectronic devices, ranging from lasers to photodetectors (PDs). Nevertheless, their inherent limitations, such as high binding energy and limited carrier mobility, have restricted their further improvement in performance. To tackle this issue, hybrid MHP microwires (MWs) are fabricated by combining MHP MWs and an organic semiconductor via a facile self‐assembly method, forming a radial heterojunction. Meanwhile, an ultrathin insulating organic layer is introduced as an interlayer between MHP MWs and the organic semiconductor. The synthesized hybrid MWs are further applied in rigid and flexible PDs, which demonstrated a high light/dark current on‐off ratio (>2 × 105), a high responsivity (>400 A W−1), and robust bending stability. These impressive results make the hybrid MHP MWs with the unique radial heterostructure promising building blocks for high‐performance future optoelectronics. [ABSTRACT FROM AUTHOR]

Single‐crystalline Sb shallow‐doped ZnO microwire wave‐guided optical resonators are synthesized via a simple carbothermal reduction method. The formation of the ZnO wave‐guided microcavities are investigated systematically, and the Sb film formed on the substrate is confirmed to be the critical factor in crystal growth. The optical signals of the annealed ZnO microcavities induced by the Sb related acceptor defects are clarified through a low‐temperature spectrum detection technology. Excitation power and temperature dependence of UV lasing properties of the ZnO microcavities annealed in different atmospheres are studied. The results reveal that such high‐quality Sb shallow‐doped ZnO wave‐guided microcavities have excellent optical responses and a strong light‐field regulation capability, which would greatly promote the development of ZnO cavity‐based photoelectronic devices. [ABSTRACT FROM AUTHOR]

Oraganolead halide perovskites (OHPs) present remarkable optoelectronic properties, and thus possess extensive applications in photovoltaic devices and photodetectors. However, the OHP‐based devices severely suffer from low environmental stability because of water invasion and oxygen erosion to the materials. In this work, this challenge is overcome by utilizing the unique advantages of the microwire structure. OHP microwires, which can be fabricated by simple and low‐cost dip coating method, present superior resistance to moisture as compare to conventional OHP films or nanowires, thanks to their combined properties of high‐crystallinity and low surface‐to‐volume ratio. Photodetectors based on the OHP microwires show outstanding long‐term stability over 90 d even stored with high relative humidity, which is among the highest stability according to the literature reports. Meanwhile, the photodetectors exhibit high and tunable sensory performance by adjusting the distribution of OHP microwires through changing the dip‐coating parameters, for example, the light‐to‐dark current ratio of the device can be over 20 000. The photodetectors with OHP microwaves deposited on polymer substrates also exhibit great mechanical flexibility. Therefore, this work reveals the unique advantages of the low‐cost and readily‐fabricated OHP microwires, and demonstrates their promising applications in optoelectronic devices by developing long‐term stable and tunable high‐performance photodetectors. Long‐term stable photodetectors based on CH3NH3PbI3 microwires fabricated by a simple and low‐cost dip‐coating method are reported. The devices show an extremely long‐term stability over 90 d even stored with high relative humidity, as well as excellent photosensory performance in terms of high On/Off ratio (up to 20 000) and high photoresponsivity (13.8 A W−1). [ABSTRACT FROM AUTHOR]