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        1. 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)