Triplet Management at Ligand-Perovskite Interface to Enhanced Photovoltaics Performance
Aromatic organic molecules are widely used as passivators in perovskite solar cells (PSCs). Efforts have been devoted to improving the energy alignments, band edge states, and defect passivation functionalities. However, potential energy loss through triplet states in such conjugated molecules has not been investigated in the past. Here, we report the observation of charge transfer from FAPbI3 to the triplet state of a pyrene (Pyr)-based cationic ligand. Such a potential loss channel can be suppressed via delicate triplet management in polycyclic aromatic compounds. Interestingly, a subtle structural modification from Pyr to the triphenylene (TP) core gave rise to shallower triplets that prohibit electron transfer from perovskites. This strategy has led to TP-passivated PSCs achieving an enhanced power conversion efficiency (PCE) of 24.69% from 23.10% in Pyr-passivated counterparts. Moreover, the devices retained above 80% initial PCE after 4000 h of light soaking, which likely benefited from the reduced triplet electron trapping at the ligand-perovskite interface.
Authors
- Jeong Hui Kim (ORCID: https://orcid.org/0009-0002-1206-5621)
- Libai Huang (ORCID: https://orcid.org/0000-0001-9975-3624)
- Yoon Ho Lee (ORCID: https://orcid.org/0000-0003-1795-7872)
- Jiaonan Sun (ORCID: https://orcid.org/0000-0002-4102-0564)
- Chenjian Lin (ORCID: https://orcid.org/0000-0002-8817-5133)
- Aidan H. Coffey (ORCID: https://orcid.org/0000-0002-3803-4965)
- Ke Ma (ORCID: https://orcid.org/0000-0003-2168-0917)
- Shuxia Tao (ORCID: https://orcid.org/0000-0002-3658-8497)
- Yuanhao Tang (ORCID: https://orcid.org/0000-0002-4882-8195)
- Hanjun Yang (ORCID: https://orcid.org/0000-0002-6856-6559)
- Chenhui Zhu (ORCID: https://orcid.org/0000-0003-1263-5065)
- Syed Joy (ORCID: https://orcid.org/0000-0001-6118-6388)
- Kenneth R. Graham (ORCID: https://orcid.org/0000-0002-6387-3998)
- Letian Dou (ORCID: https://orcid.org/0000-0001-6411-8591)
- Wenhao Shao (ORCID: https://orcid.org/0000-0002-5237-0076)
- Zijin Wu
- Limei Wang
- Wenzhan Xu (ORCID: https://orcid.org/0000-0002-1972-6392)
Institutions
- University of Kentucky (US)
- Lawrence Berkeley National Laboratory (US)
- Sungshin Women's University (KR)
- Shanghai Jiao Tong University (CN)
- Purdue University West Lafayette (US)
- Eindhoven University of Technology (NL)
Publication Details
- Journal
- ACS Energy Letters
- Published
- 2024-08-09
- DOI
- https://doi.org/10.1021/acsenergylett.4c01853
- Citations
- 5
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.04
Funders
- Purdue University
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
- Solar Energy Technologies Office