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  • Lead halide perovskites are intensively studied in past few years due to their
    potential applications in optoelectronic devices such as solar cells, photodetectors,
    light-emitting diodes (LED), and lasers. In addition to the rapid
    developments in material synthesis and device fabrication, it is also very
    interesting to postsynthetically control the optical properties with external
    irradiations. Here, the influences of very low energy (10–20 keV) electron
    beam of standard electron beam lithography are experimentally explored on
    the properties of lead halide perovskites. It is confirmed that the radiolysis
    process also happens and it can selectively change the photoluminescence,
    enabling the direct formation of nanolaser array, microsized light emitter
    array, and micropictures with an electron beam writer. Interestingly, it is
    found that discontinuous metallic lead layers are formed on the top and
    bottom surfaces of perovskite microplate during the radiolysis process, which
    can act as carrier conducting layers and significantly increase the photocurrent
    of perovskite photodetector by a factor of 217%. By using the electron
    beam with low energy to modify the perovskite, this method promises to
    shape the emission patterns for micro-LED with well-preserved optical properties
    and improves the photocurrent of photodetector.


    Ningbo Yi,Shuai Wang,Zonghui Duan,Kaiyang Wang,Qinghai Song,Shumin Xiao.


    Advanced Materials,29:34,1701636(2017)