Impact of the Hole Transport Layer on the Charge Extraction of Ruddlesden-Popper Perovskite Solar Cells

Qingqian Wang*, Shuyan Shao, Bowei Xu, Herman Duim, Jingjin Dong, Sampson Adjokatse, Giuseppe Portale, Jianhui Hou, Michele Saba, Maria A Loi

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Recent works demonstrate that polyelectrolytes as a hole transport layer (HTL) offers superior performance in Ruddlesden-Popper perovskite solar cells (RPPSCs) compared to poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS). The factors contributing to such improvement need to be systematically investigated. To achieve this, we have systematically investigated how the two HTLs affect the morphology, crystallinity, and orientation of the Ruddlesden-Popper perovskite (RPP) films as well as the charge extraction of the RPPSCs. PEDOT:PSS as a HTL leads to RPP films of low crystallinity and with a number of large pinholes. These factors lead to poor charge carrier extraction and significant charge recombination in the RPPSCs. Conversely, a PCP-Na HTL gives rise to highly crystalline and pinhole-free RPPSC films. Moreover, a PCP-Na HTL provides a better energy alignment at the perovskite/HTL interface because of its higher work function compared to PEDOT:PSS. Consequently, devices using PCP-Na as HTLs are more efficient in extracting charge carriers.

Original languageEnglish
Pages (from-to)29505–29512
Number of pages8
JournalACS Applied Materials & Interfaces
Volume12
Issue number26
Early online date17-Jun-2020
DOIs
Publication statusPublished - 1-Jul-2020

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