Guanidium-assisted crystallization engineering for highly efficient CsPbI3 solar cells

Shuo Wang, Youkui Xu, Qian Wang*, Xufeng Zhou, ZhenHua Li*, Meng Wang, Yutian Lei, Hong Zhang, Haoxu Wang, Zhiwen Jin

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
19 Downloads (Pure)


Iodine vacancies and uncoordinated iodide ions of CsPbI3 films are mainly responsible for nonradiative recombination. Here, we report a composition-engineering passivation method that through guanidium (GA+) and I forms strong hydrogen bonds to passivate iodine vacancies and reduce defects. Both experimental and theoretical results confirmed strong chemical interactions between GA+ and uncoordinated I in the GAxCs1−xPbI3 bulk or at the grain boundary. Moreover, GA+ doping could slow down the crystallization speed of perovskite films during the deposition process. As a result, we observed GA+ modified films with much lower defect density, larger grain size, and better carrier extraction and transportation. Upon GA+ passivation, the power conversion efficiency (PCE) is boosted from 18.01% to 19.05%, with open-circuit voltage (VOC) enhancement from 1.08 V to 1.14 V.

Original languageEnglish
Pages (from-to)8234-8240
Number of pages7
JournalJournal of Materials Chemistry C
Issue number21
Publication statusPublished - 2022

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