Document Type

Journal Article

Department/Unit

Department of Physics

Title

High Built‐in Potential Perovskite Solar Cells Realized by Incorporating a Hybrid Hole Extraction Layer

Language

English

Abstract

The performance of perovskite solar cells (PSCs) has been improved substantially over the past few years. However, the related fundamental understanding of improving the built‐in potential on the efficiency of the PSCs is still far from adequate. A combination of morphology, charge extraction, and built‐in potential studies would help us to gain an insight on efficient operation of the PSCs. Herein, the effect of the hybrid hole extraction layer (HEL), comprising a mixture of tungsten oxide (WO3) and poly(3,4‐ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) (WO3–PEDOT:PSS), on the growth of the perovskite photoactive layer and built‐in potential in PSCs is investigated using structural analyses, photoelectron spectroscopy, and transient photocurrent (TPC) measurements. It shows that the use of hybrid HEL is an effective approach for enhancing the built‐in potential across the photoactive layer in the PSCs, leading to >20% increase in power conversion efficiency as compared to that of a control PSC prepared using a pristine PEDOT:PSS HEL. PSCs with a higher built‐in potential are favorable for efficient cell operation, as manifested by the charge extraction analyses and TPC measurements.

Keywords

built-in potentials, charge extractions, hybrid hole extraction layers, perovskite solar cells

Publication Date

2020

Source Publication Title

Solar RRL

Publisher

Wiley

DOI

10.1002/solr.202000393

Link to Publisher's Edition

https://doi.org/10.1002/solr.202000393

ISSN (electronic)

2367198X

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