Document Type

Journal Article

Department/Unit

Department of Physics; Institute of Advanced Material

Language

English

Abstract

The high performing ultra violet (UV) to near infrared (NIR) light broadband phototransistors (PTs) are enabled by incorporating a bi-layer methylammonium lead triiodide (MAPbI3) perovskite/NIR light absorbing diketopyrrolopyrrole-dithienylthieno[3,2-b]thiophene (DPP-DTT) polymer channel. The bi-layer MAPbI3/DPP-DTT channel takes the advantages of (1) complementary absorption and (2) high charge transport efficiency of the two materials. The on- and off-state transfer characteristics of the bi-layer MAPbI3/DPP-DTT channel PTs, in the presence of different sources of UV, visible and NIR light, were analyzed. The bi-layer MAPbI3/DPP-DTT channel PTs possess simultaneously a specific detectivity (D*) of >109 Jones over the UV to visible light wavelength range and a high D* of >107 Jones over the NIR light wavelength range. The broadband PTs can be operated at a low voltage (-1 V) without showing the persistent photoconductivity behavior. The results are very encouraging. It is anticipated that the bi-layer perovskite/NIR light absorbing polymer channel concept is a very promising approach for attaining high performance UV to NIR light broadband PTs.

Publication Date

4-2019

Source Publication Title

Journal of Materials Chemistry C

Volume

7

Issue

16

Start Page

4808

End Page

4816

Publisher

Royal Society of Chemistry

DOI

10.1039/C8TC06229C

Link to Publisher's Edition

https://doi.org/10.1039/C8TC06229C

ISSN (print)

20507526

Available for download on Friday, May 01, 2020

Included in

Physics Commons

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