Arylammonium-Assisted Reduction of the Open-Circuit Voltage Deficit in Wide-Bandgap Perovskite Solar Cells: The Role of Suppressed Ion Migration
Journal Article
·
· ACS Energy Letters
- Univ. of Toledo, OH (United States); Wuhan Univ. (China); University of Toledo
- Univ. of Toledo, OH (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Wuhan Univ. (China)
Surface treatment using large alkyl/aryl ammonium cations has demonstrated reduced open-circuit voltage (VOC) deficits in perovskite solar cells (PSCs), but the origin of the improvements has been vaguely attributed to defect passivation. Here, we combine the microscopic probing of the local electrical properties, thermal admittance spectroscopic analysis, and first principles calculations to elucidate the critical role of arylammonium interface layers on suppressing the ion migration in wide-bandgap (WBG) PSCs. Our results reveal that arylammonium surface treatment using phenethylammonium iodide increases the activation energy barrier for ion migration on the surface, which suppresses the accumulation of charge defects at surface and grain boundaries (GBs), leading to reduced dark saturation current density in WBG PSCs. Furthermore, with device optimization, our champion 1.73-eV PSC delivers a power conversion efficiency of 19.07% with a VOC of 1.25 V, achieving a VOC-deficit of 0.48 V.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States); Univ. of Toledo, OH (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Grant/Contract Number:
- AC36-08GO28308; EE0008753
- OSTI ID:
- 1644254
- Alternate ID(s):
- OSTI ID: 1677446
- Report Number(s):
- NREL/JA-5K00-78015
- Journal Information:
- ACS Energy Letters, Journal Name: ACS Energy Letters Vol. 5; ISSN 2380-8195
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
41 EE - Solar Energy Technologies Office (EE-4S)
Defects
Electrical conductivity
Ions
Perovskites
Solar cells
activation energy
calculations
conversion efficiency
energy gap
grain boundaries
ions
open circuit voltage
perovskite
spectroscopic analysis
surface treatment
timing circuits
41 EE - Solar Energy Technologies Office (EE-4S)
Defects
Electrical conductivity
Ions
Perovskites
Solar cells
activation energy
calculations
conversion efficiency
energy gap
grain boundaries
ions
open circuit voltage
perovskite
spectroscopic analysis
surface treatment
timing circuits