Terpyridine-zinc(ii) coordination nanosheets as modulators of perovskite crystallization to enhance solar cell efficiency

Ying Chiao Wang, Chun Hao Chiang, Chun Jen Su, Je Wei Chang, Chi Ying Lin, Chia Chun Wei, Shao Ku Huang, Hiroaki Maeda, Wen Bin Jian, U. Ser Jeng*, Kazuhito Tsukagoshi*, Chun Wei Chen*, Hiroshi Nishihara*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The high efficiency of precursor-to-perovskite conversion is one of the core factors in boosting the performance of perovskite solar cells (PSCs). Herein, we report a liquid/liquid interfacial synthesis of terpyridine-zinc(ii) (ZnTPY) coordination nanosheets (CONASHs), which can enhance PbI2-based perovskite crystallization and thus the efficiency of PSCs. Ultrasonically fragmented ZnTPY CONASHs, rich in uncoordinated terpyridine moieties, caused multidentate chelation with PbI2, resulting in a well-dispersed ZnTPY:PbI2 complex. This metal-organic complex could act as a heterogeneous nucleation seed and facilitate the formation of a PbI2-to-[PbI6−x]4− coordinated octahedral framework in a precursor solution of perovskite, thereby reducing the crystallization barrier of tetragonal CH3NH3PbI3 perovskites and achieving a complete precursor-to-perovskite conversion. Consequently, ZnTPY-capped perovskite crystals had a long photoluminescence (PL) lifetime, which is attributed to the more passivated trap states associated with ZnTPY. The corresponding PSCs exhibited an optimal power conversion efficiency of 19.8% compared with 17.9% of the controlled device. The results prove that the performance of PSC families can be improved by dispersing PbI2 in a solution with CONASHs for enhancing the PbI2-to-perovskite conversion.

Original languageEnglish
Pages (from-to)7077-7084
Number of pages8
JournalJournal of Materials Chemistry A
Volume11
Issue number13
DOIs
StatePublished - 1 Mar 2023

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