Nonvolatile Rewritable Photomemory Arrays Based on Reversible Phase‐Change Perovskite for Optical Information Storage
Nonvolatile Rewritable Photomemory Arrays Based on Reversible Phase‐Change Perovskite for Optical Information Storage
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DOI：
10.1002/adom.201900558
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发表时间：
2019-05
影响因子：
9
通讯作者：
Chen Zou;Jiajiu Zheng;Cheng Chang;A. Majumdar;Lih Y. Lin
中科院分区：
文献类型：
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作者：
Chen Zou;Jiajiu Zheng;Cheng Chang;A. Majumdar;Lih Y. Lin
光信号的高传输速度及其在光计算中的应用使得对光子编程存储设备的需求不断增长。光存储（PM）设备不是使用电脉冲以两种状态之一存储数据，而是利用光刺激来存储光信息。在这项工作中，展示了使用气相沉积工艺生长的光致变色无机钙钛矿 CsPbIBr2 的非易失性可重写 PM 阵列的应用。 CsPbIBr2 薄膜通过激光诱导的热和湿气暴露实现了斜方 (δ) 和立方 (α) 相之间的可逆相变。光学吸收钙钛矿相中的 PM 像素的光响应性约为透明彩色非钙钛矿相中的 PM 像素的 50 倍。存储光学数据是通过近红外激光加热像素来实现的，而湿气暴露则用于擦除存储的信息。非易失性PM阵列表现出出色的写-读-擦除循环耐久性和数据保留能力，在空气中存储一周后性能没有明显下降。这项工作展示了气相沉积无机钙钛矿在光学信息存储方面的应用前景，以及它们在光开关、可调谐超表面和许多其他应用中的独特潜力。
The high transmission speed of optical signals and their application in optical computation have created a growing demand for photon‐programmed memory devices. Rather than using electrical pulses to store data in one of two states, the photomemory (PM) devices exploit the optical stimulation to store the light information. In this work, the application of a nonvolatile rewritable PM array using the photochromic inorganic perovskite CsPbIBr2 grown by a vapor‐deposition process is demonstrated. Reversible phase transitions between orthorhombic (δ) and cubic (α) phases are achieved in CsPbIBr2 films through laser‐induced heat and moisture exposure. The PM pixels in an optically absorbing perovskite phase exhibit ≈50‐fold photoresponsivity as large as those in a transparent‐colored non‐perovskite phase. Storing optical data are achieved by heating pixels through a near‐infrared laser, while moisture exposure is used to erase the stored information. The nonvolatile PM array exhibits great write‐read‐erase cycle endurance and data retention capability without obvious performance degradation after storage in air for one week. This work demonstrates the promising application of vapor‐deposited inorganic perovskite for optical information storage and the unique potential of them for use in optical switches, tunable metasurfaces, and many other applications.