Tuning Hole Transport Layer Using Urea for High-Performance Perovskite Solar Cells

Elbohy, Hytham; Bahrami, Behzad; Mabrouk, Sally; Reza, Khan Mamun; Gurung, Ashim; Pathak, Rajesh; Liang, Mao; Qiao, Qiquan; Zhu, Kai

doi:10.1002/adfm.201806740

Title: Tuning Hole Transport Layer Using Urea for High-Performance Perovskite Solar Cells

Journal Article · 17 December 2018 · Advanced Functional Materials

DOI: https://doi.org/10.1002/adfm.201806740 · OSTI ID:1490995

Elbohy, Hytham ^[1]; Bahrami, Behzad ^[2]; Mabrouk, Sally ^[2]; Reza, Khan Mamun ^[2]; Gurung, Ashim ^[2]; Pathak, Rajesh ^[2]; Liang, Mao ^[3]; Qiao, Qiquan ^[2];

^[4]

South Dakota State Univ., Brookings, SD (United States); Damietta Univ., New Damietta (Egypt)
South Dakota State Univ., Brookings, SD (United States)
South Dakota State Univ., Brookings, SD (United States); Tianjin Univ. of Technology, Tianjin (People's Republic of China)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

Interface engineering is critical to the development of highly efficient perovskite solar cells. Here, urea treatment of hole transport layer (e.g., poly(3,4-ethylene dioxythiophene):polystyrene sulfonate (PEDOT:PSS)) is reported to effectively tune its morphology, conductivity, and work function for improving the efficiency and stability of inverted MAPbI₃ perovskite solar cells (PSCs). This treatment has significantly increased MAPbI₃ photovoltaic performance to 18.8% for the urea treated PEDOT:PSS PSCs from 14.4% for pristine PEDOT:PSS devices. The use of urea controls phase separation between PEDOT and PSS segments, leading to the formation of a unique fiber-shaped PEDOT:PSS film morphology with well-organized charge transport pathways for improved conductivity from 0.2 S cm^-1 for pristine PEDOT:PSS to 12.75 S cm^-1 for 5 wt% urea treated PEDOT:PSS. The urea-treatment also addresses a general challenge associated with the acidic nature of PEDOT:PSS, leading to a much improved ambient stability of PSCs. Additionally, the device hysteresis is significantly minimized by optimizing the urea content in the treatment.

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

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1490995

Report Number(s):: NREL/JA--5900-72477

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 47 Vol. 29; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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14 SOLAR ENERGY
36 MATERIALS SCIENCE
conductivity
hole transport material
perovskite solar cells
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Title: Tuning Hole Transport Layer Using Urea for High-Performance Perovskite Solar Cells

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