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]; Lu, Haipeng ^[2]; Dunfield, Sean ^[1]; Kim, Dong Hoe ^[2]; Chen, Xihan ^[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]; Zhang, Fei ^[2]; Zhu, Kai ^[2]

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1. National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)
2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
3. 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.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• Sponsoring Organization: National Research Foundation of Korea (NRF); 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)
• Grant/Contract Number: 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: Wiley
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
2D perovskite passivation agent
charge transport
wide-bandgap perovskite solar cell