Gradient band structure: High performance perovskite solar cells using poly(bisphenol A anhydride-: Co-1,3-phenylenediamine)

Hiroyuki Kanda, Naoyuki Shibayama, Mousa Abuhelaiqa, Sanghyun Paek, Ryuji Kaneko, Nadja Klipfel, Albertus Adrian Sutanto, Cristina Roldán Carmona, Aron Joel Huckaba, Hobeom Kim, Cristina Momblona, Abdullah M. Asiri, Mohammad Khaja Nazeeruddin

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Surface passivation is a critical factor for improving the photovoltaic performance of perovskite solar cells. However, more robust principle investigations are required to build effective passivation strategies enabling high-performance perovskite solar cells. Here, it is demonstrated that a non-reactive organic polymer induces band-bending at the perovskite surface through a passivation effect, furthermore suppressing Pb formation at the perovskite surface. Consequently, the photovoltaic performance and stability of the perovskite solar cells can be improved. The key findings show that the polymer passivation layer can control the Fermi-level at the perovskite surface, which changes the band structure at the perovskite surface and affects carrier dynamics by suppressing non-radiative pathways. Moreover, the organic polymer can prevent degradation of the perovskite surface. By using the passivating layer, the open circuit voltage improves from 1.046 to 1.100 V, the photoconversion efficiency exceeds 21%, and the stability of the perovskite solar cells is substantially improved. The organic polymer poly(bisphenol A anhydride-co-1,3-phenylenediamine) (PEIm) was used to control the perovskite band structure, and this passivation mechanism is revealed here.

Original languageEnglish
Pages (from-to)17113-17119
Number of pages7
JournalJournal of Materials Chemistry A
Volume8
Issue number33
DOIs
StatePublished - Sep 7 2020

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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