Journal
SMALL
Volume 15, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201805545
Keywords
dark current; intramolecular p-n junctions; photodetectors; photovoltaic devices; WSe2
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Funding
- National Natural Science Foundation of China [11734016, 61674157, 61521005, 61725505]
- Key Research Project of Frontier Sciences of CAS [QYZDB-SSWJSC031]
- Fund of SITP Innovation Foundation [CX-193, CX-239]
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High quality p-n junctions based on 2D layered materials (2DLMs) are urgent to exploit, because of their unique properties such as flexibility, high absorption, and high tunability which may be utilized in next-generation photovoltaic devices. Based on transfer technology, large amounts of vertical heterojunctions based on 2DLMs are investigated. However, the complicated fabrication process and the inevitable defects at the interfaces greatly limit their application prospects. Here, an in-plane intramolecular WSe2 p-n junction is realized, in which the n-type region and p-type region are chemically doped by polyethyleneimine and electrically doped by the back-gate, respectively. An ideal factor of 1.66 is achieved, proving the high quality of the p-n junction realized by this method. As a photovoltaic detector, the device possesses a responsivity of 80 mA W-1 (approximate to 20% external quantum efficiency), a specific detectivity of over 10(11) Jones and fast response features (200 mu s rising time and 16 mu s falling time) at zero bias, simultaneously. Moreover, a large open-circuit voltage of 0.38 V and an external power conversion efficiency of approximate to 1.4% realized by the device also promises its potential in microcell applications.
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