Carbazole-Based Hole-Transport Materials for High-Efficiency and Stable Perovskite Solar Cells

Gao, Liguo; Schloemer, Tracy H.; Zhang, Fei; Chen, Xihan; Xiao, Chuanxiao; Zhu, Kai; Sellinger, Alan

doi:10.1021/acsaem.0c00179

Carbazole-Based Hole-Transport Materials for High-Efficiency and Stable Perovskite Solar Cells

Journal Article · Wed Apr 22 00:00:00 EDT 2020 · ACS Applied Energy Materials

DOI:https://doi.org/10.1021/acsaem.0c00179· OSTI ID:1660146

^[1]; ^[2]; ^[3]; ^[3]; Xiao, Chuanxiao ^[3]; ^[3]; ^[4]

National Renewable Energy Laboratory (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States); Dalian Univ. of Technology (China)
Colorado School of Mines, Golden, CO (United States)
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)

As organic–inorganic halide perovskite solar cells (PSCs) near commercialization, stability challenges during real-world conditions, such as durability at elevated temperatures, still need to be addressed. We have previously reported that doping of triarylamine-based hole-transport layers (HTLs) with a triarylamine-based radical cation salt (EHCz-3EtCz/EH44-ox) leads to enhanced PSC stability at elevated temperatures. While it was shown the radical cation dopant did not need to be identical to the HTL matrix, little was known about dopant exchange to realize the maximum impact on device-level properties (e.g., increase in low intrinsic conductivity, mobility, hydrophobic properties, ease of synthesis, and thermal stability). In this paper, we study the impact of dopant exchange among stable, low-cost, high-glass-transition temperature (Tg), and easily synthesized triarylamine-based HTL and radical triarylamine cation salts as dopants. Using EH44-ox as dopant leads to the improved device-level power conversion efficiency (PCE) for all HTL matrices assessed. Moreover, increasing the number of ethylhexyl chains from one to two per molecule and positioning these chains at the periphery rather than the core resulted in improved hydrophobicity. PSCs based on our HTL formulations have similar power conversion efficiencies (PCE) as those of PSCs based on commercially available HTLs while demonstrating greatly improved device-level stability at elevated temperatures.

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)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1660146

Report Number(s):: NREL/JA--5900-76368; MainId:6542; UUID:87a235d3-6366-ea11-9c31-ac162d87dfe5; MainAdminID:15201

Journal Information:: ACS Applied Energy Materials, Journal Name: ACS Applied Energy Materials Journal Issue: 5 Vol. 3; ISSN 2574-0962

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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14 SOLAR ENERGY
36 MATERIALS SCIENCE
EH44-ox
EtCz-3EHCz
dopant exchange
hole transport layers
perovskite solar cells

Carbazole-Based Hole-Transport Materials for High-Efficiency and Stable Perovskite Solar Cells

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