Enhancing Charge Transport of 2D Perovskite Passivation Agent for Wide-Bandgap Perovskite Solar Cells Beyond 21%

Ye, Jiselle; Tong, Jinhui; Hu, Jun; Xiao, Chuanxiao; Lu, Haipeng; Dunfield, Sean; Kim, Dong Hoe; Chen, Xihan; Larson, Bryon W.; Hao, Ji; Wang, Kang; Zhao, Qian; Chen, Zheng; Hu, Huamin; You, Wei; Berry, Joseph; Zhang, Fei; Zhu, Kai

doi:10.1002/solr.202000082

Enhancing Charge Transport of 2D Perovskite Passivation Agent for Wide-Bandgap Perovskite Solar Cells Beyond 21%

Journal Article · Mon Mar 23 00:00:00 EDT 2020 · Solar RRL

DOI:https://doi.org/10.1002/solr.202000082· OSTI ID:1660039

Ye, Jiselle ^[1]; Tong, Jinhui ^[2]; Hu, Jun ^[3]; Xiao, Chuanxiao ^[2]; ^[2]; Dunfield, Sean ^[1]; Kim, Dong Hoe ^[2]; ^[2]; Larson, Bryon W. ^[2]; Hao, Ji ^[2]; Wang, Kang ^[2]; Zhao, Qian ^[2]; Chen, Zheng ^[3]; Hu, Huamin ^[3]; You, Wei ^[3]; Berry, Joseph ^[2]; ^[2]; Zhu, Kai ^[2]

National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Univ. of North Carolina, Chapel Hill, NC (United States)

The replacement of a small amount of organic cations with bulkier organic spacer cations in the perovskite precursor solution to form a 2D perovskite passivation agent (2D-PPA) in 3D perovskite thin films has recently become a promising strategy for developing perovskite solar cells (PSCs) with long-term stability and high efficiency. However, the long, bulky organic cations often form a barrier, hindering charge transport. In this study, for the first time, 2D-PPA engineering based on wide-bandgap (~1.68?eV) perovskites are reported. Pentafluorophenethylammonium (F5PEA+) is introduced to partially replace phenylethylammonium (PEA+) as the 2D-PPA, forming a strong noncovalent interaction between the two bulky cations. The charge transport across and within the planes of pure 2D perovskites, based on mixed ammoniums, increases by a factor of five and three compared with that of mono-cation 2D perovskites, respectively. The perovskite films based on mixed-ammonium (F5PEA+-PEA+) 2D-PPA exhibit similar surface morphology and crystal structure, but longer carrier lifetime, lower exciton binding energy, less trap density and higher conductivity, in comparison with those using mono-cation (PEA+) 2D-PPA. The performance of PSCs based on mixed-cation 2D-PPA is enhanced from 19.58% to 21.10% along with improved stability, which is the highest performance for reported wide-bandgap PSCs.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Research Foundation of Korea (NRF)

Grant/Contract Number:: AC36-08GO28308; AC36-08GO28308

OSTI ID:: 1660039

Alternate ID(s):: OSTI ID: 1605949

Report Number(s):: NREL/JA-5900-75004; MainId:5965; UUID:0fbcaa73-ccdf-e911-9c26-ac162d87dfe5; MainAdminID:13804

Journal Information:: Solar RRL, Journal Name: Solar RRL Journal Issue: 6 Vol. 4; ISSN 2367-198X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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