Issue 35, 2021

Efficient hole transport layers based on cross-linked poly(N-vinylcarbazole) for high-performance perovskite photodetectors

Abstract

Hole transport layers (HTLs) play a significant role in organic–inorganic hybrid perovskite (OIHP) photodetectors for effective hole extraction and transport, energy level alignment, and interface optimization. To date, poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine) (PTAA) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) are commonly used as HTLs, but both of them have some disadvantages that affect the performance of devices, such as high hydrophobicity, intrinsic hydrophilicity and acid nature. Herein, a p-type cross-linked polymer material poly(N-vinylcarbazole) (PVK) doped with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), has been explored as an efficient HTL and was first introduced in p–i–n type OIHP photodetectors. The non-wetting PVK HTL leads to large perovskite grains, and the F4TCNQ assists hole extraction and transport in interfaces, and even reduces the carrier recombination. The champion device demonstrates over 80% external quantum efficiency (EQE) with a striking increase of 20% compared with the dopant-free devices. Additionally, the optimal doped device exhibits a low dark current density of 5.23 × 10−4 mA cm−2 under −0.1 V. As a result, this work provides a novel candidate for a solution-processed HTL to achieve high-performance OIHP photodetectors.

Graphical abstract: Efficient hole transport layers based on cross-linked poly(N-vinylcarbazole) for high-performance perovskite photodetectors

Supplementary files

Article information

Article type
Paper
Submitted
25 mar 2021
Accepted
30 apr 2021
First published
01 may 2021

J. Mater. Chem. C, 2021,9, 11722-11728

Efficient hole transport layers based on cross-linked poly(N-vinylcarbazole) for high-performance perovskite photodetectors

L. He, D. Wang, Y. Zhao, Y. Zhang, W. Wei and L. Shen, J. Mater. Chem. C, 2021, 9, 11722 DOI: 10.1039/D1TC01367J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements