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

Ali Asgher Syed, Linfeng Cai, Furong Zhu*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Article number2000393
Number of pages7
JournalSolar RRL
Issue number11
Early online date20 Aug 2020
Publication statusPublished - Nov 2020

Scopus Subject Areas

  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

User-Defined Keywords

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


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