Hydrogen Bonding Drives the Self-Assembling of Carbazole-based Hole-Transport Material for Enhanced Efficiency and Stability of Perovskite Solar Cells

Cheng Wang, Maning Liu, Sunardi Rahman, Hannu Pasanen, Jingshu Tian, Jianhui Li, Zhifeng Deng, Haichang Zhang, Paola Vivo

Research output: Contribution to journalArticleScientificpeer-review

8 Downloads (Pure)

Abstract

Designing a hole-transport material (HTM) that guarantees effective hole transport while self-assembling at the perovskite|HTM interface with the formation of an ordered interlayer, has recently emerged as a promising strategy for high-performance and stable perovskite solar cells (PSCs). Hydrogen bonding (HB) is a versatile multi-functional tool for the design of small molecular HTMs. However, to date, its employment is mostly limited to p-i-n inverted PSCs. This study demonstrates the advantages of a novel HTM design that can self-assemble into a long-range ordered interlayer on the perovskite surface via HB association. A hydro-functional HTM (O1) is compared to a reference HTM (O2) that cannot form HB due to the replacement of the amide group of O1 with a plain butyl alkyl chain in O2. As a result, O1-based n-i-p PSCs display enhanced hole extraction reaction, suppressed interfacial charge recombination, reduced hysteresis effect, and an increase in Voc (by 60 mV), FF (>11% increase), and overall power conversion efficiency, PCE (32% increase) compared to the case of HB-free O2-based devices. Remarkable stability is observed for unencapsulated O1 cells, with a T80 lifetime of 35.5 h under continuous maximum power point tracking in air. This work emphasizes the role of HB-directed self-assembling in simultaneously enhancing both the PCE and stability of popular n-i-p PSCs. This study paves the way for the development of new hydro-functional charge-transport material designs for efficient and stable PSCs.
Original languageEnglish
Article number107604
JournalNANO ENERGY
Volume101
DOIs
Publication statusPublished - 2022
Publication typeA1 Journal article-refereed

Publication forum classification

  • Publication forum level 3

Fingerprint

Dive into the research topics of 'Hydrogen Bonding Drives the Self-Assembling of Carbazole-based Hole-Transport Material for Enhanced Efficiency and Stability of Perovskite Solar Cells'. Together they form a unique fingerprint.

Cite this