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Proceedings Paper

Improved perovskite phototransistor prepared using multi-step annealing method
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Paper Abstract

Organic-inorganic hybrid perovskites with good intrinsic physical properties have received substantial interest for solar cell and optoelectronic applications. However, perovskite film always suffers from a low carrier mobility due to its structural imperfection including sharp grain boundaries and pinholes, restricting their device performance and application potential. Here we demonstrate a straightforward strategy based on multi-step annealing process to improve the performance of perovskite photodetector. Annealing temperature and duration greatly affects the surface morphology and optoelectrical properties of perovskites which determines the device property of phototransistor. The perovskite films treated with multi-step annealing method tend to form highly uniform, well-crystallized and high surface coverage perovskite film, which exhibit stronger ultraviolet-visible absorption and photoluminescence spectrum compare to the perovskites prepared by conventional one-step annealing process. The field-effect mobilities of perovskite photodetector treated by one-step direct annealing method shows mobility as 0.121 (0.062) cm2V-1s-1 for holes (electrons), which increases to 1.01 (0.54) cm2V-1s-1 for that treated with muti-step slow annealing method. Moreover, the perovskite phototransistors exhibit a fast photoresponse speed of 78 μs. In general, this work focuses on the influence of annealing methods on perovskite phototransistor, instead of obtains best parameters of it. These findings prove that Multi-step annealing methods is feasible to prepared high performance based photodetector.

Paper Details

Date Published: 21 February 2018
PDF: 9 pages
Proc. SPIE 10529, Organic Photonic Materials and Devices XX, 105290I (21 February 2018);
Show Author Affiliations
Mingxuan Cao, Tianjin Univ. (China)
Southern Univ. of Science and Technology (China)
Yating Zhang, Tianjin Univ. (China)
Southern Univ. of Science and Technology (China)
Yu Yu, Tianjin Univ. (China)
Southern Univ. of Science and Technology (China)
Jianquan Yao, Tianjin Univ. (China)
Southern Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 10529:
Organic Photonic Materials and Devices XX
Christopher E. Tabor; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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