Issue 10, 2023

Understanding the dopant of hole-transport polymers for efficient inverted perovskite solar cells with high electroluminescence

Abstract

Poly(triarylamine) (PTAA) is a promising hole transport polymer for efficient inverted perovskite solar cells (PSCs) and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) is an indispensable dopant for PTAA. However, the interplay between PTAA and F4TCNQ and its effects on the device operation of PSCs are still unknown. Herein, the fundamental interaction between PTAA and F4TCNQ was systematically studied using a combination of extensive theoretical calculations and detailed experimental approaches. The results reveal that the π–π stacking formed between PTAA and F4TCNQ was favorable for improving the spatial configuration of PTAA and the charge transfer between PTAA and F4TCNQ. Meanwhile, a C[triple bond, length as m-dash]N⋯Pb2+ coordination bond and N–H⋯N hydrogen bond could be built between F4TCNQ and perovskites, substantially improving the quality of perovskite films and the interfacial properties between perovskite and PTAA and thus enhancing hot-carrier injection. Consequently, an inverted PSC fabricated with PTAA doped with F4TCNQ yielded a high efficiency of up to 22.5% and demonstrated high electroluminescence with an external quantum efficiency of 4.6%. Meanwhile, PSCs showed good stability under continuous illumination and thermal conditions. This work offers a deeper understanding of the interplay between the dopant and hole transport polymer and highlights the important design criterion of dopants for hole transport polymers toward the higher photovoltaic performance of PSCs.

Graphical abstract: Understanding the dopant of hole-transport polymers for efficient inverted perovskite solar cells with high electroluminescence

Supplementary files

Article information

Article type
Paper
Submitted
29 Oct 2022
Accepted
26 Jan 2023
First published
28 Jan 2023

J. Mater. Chem. A, 2023,11, 5199-5211

Understanding the dopant of hole-transport polymers for efficient inverted perovskite solar cells with high electroluminescence

Q. Zhou, J. Qiu, R. Zhuang, X. Mei, Y. Hua and X. Zhang, J. Mater. Chem. A, 2023, 11, 5199 DOI: 10.1039/D2TA08443K

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