journal article·2024-09-13Open access

Triplet Management at Ligand-Perovskite Interface to Enhanced Photovoltaics Performance

Yuanhao Tang, Hanjun Yang, Jiaonan Sun, Zijin Wu, Wenhao Shao, Syed Joy, Jeong Hui Kim, Wenzhan Xu, Aidan H. Coffey, Yoon Ho Lee, Chenjian Lin, Limei Wang, Ke Ma, Chenhui Zhu, Kenneth R. Graham, Shuxia Tao, Libai Huang, Letian Dou

ACS Energy Letters· Volume 9· Issue 9

Abstract

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 FAPbI 3 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.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, United States

Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States

Materials Simulation & Modelling, Department of Applied Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands

Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Department of Environment and Energy Engineering, Sungshin Women’s University, Seoul 01133, Republic of Korea

Global Institute of Future Technology, Shanghai Jiao Tong University, Shanghai, 200240, China

Birck Nanotechnology Center, Purdue University; West Lafayette, Indiana 47907, United States

Funding

Solar Energy Technologies Office · Purdue University · Nederlandse Organisatie voor Wetenschappelijk Onderzoek

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