TY - JOUR
T1 - Interface Engineering of Pb–Sn Low-Bandgap Perovskite Solar Cells for Improved Efficiency and Stability
AU - Ghimire, Nabin
AU - Gurung, Ashim
AU - Bobba, Raja Sekhar
AU - Reza, Khan Mamun
AU - Lamsal, Buddhi Sagar
AU - Laskar, Md Ashiqur Rahman
AU - Pokharel, Jyotshna
AU - He, Wei
AU - Baniya, Abiral
AU - Zhou, Yue
AU - Qiao, Quinn
N1 - Funding Information:
The authors thank EDA University Center Program (ED18DEN3030025), NSF MRI (1428992), SD BOR R&D Grant Program, and Planning IUCRC CEPS Projects for supporting this research work. All findings or information available in this article does not reflect the views of these funding agencies/programs.
Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/4
Y1 - 2022/4
N2 - Because of their inferior film quality, Pb–Sn-mixed low-bandgap (LBG) perovskites suffer from poor charge transportation, compromising photovoltaic parameters of final solar cells. Herein, an approach to improve the quality of the charge interface layer is proposed, in which a thin layer of hydrophobic [bis (4-phenyl) (2, 4, 6-trimethylphenyl) amine] (PTAA) is inserted between the hole-selective layer of hydrophilic poly (3, 4-ethylenedioxythiophene) -polystyrenesulfonicacid (PEDOT:PSS) and LBG perovskite layer. The introduction of a tiny layer of the hydrophobic PTAA acts as a shield layer to protect the underlying acidic PEDOT:PSS layer from moisture-related degradation and works as an intermediary layer to facilitate the growth of significantly larger perovskite grains; these enlarged grains are indicative of enhanced crystallinity and fewer grain boundaries in the perovskite layer. The fewer grain boundaries lead to suppression of interfacial defects and result in enhanced charge collection at the hole transport layer/perovskite interface, thus improving the open-circuit voltage up to 0.85 V and fill factor up to ≈78%, eventually boosting the power conversion efficiency of the champion cell up to 19.08%. Herein, a simple interface engineering route to fabricate efficient and stable Pb–Sn-mixed LBG perovskite solar cells is offered.
AB - Because of their inferior film quality, Pb–Sn-mixed low-bandgap (LBG) perovskites suffer from poor charge transportation, compromising photovoltaic parameters of final solar cells. Herein, an approach to improve the quality of the charge interface layer is proposed, in which a thin layer of hydrophobic [bis (4-phenyl) (2, 4, 6-trimethylphenyl) amine] (PTAA) is inserted between the hole-selective layer of hydrophilic poly (3, 4-ethylenedioxythiophene) -polystyrenesulfonicacid (PEDOT:PSS) and LBG perovskite layer. The introduction of a tiny layer of the hydrophobic PTAA acts as a shield layer to protect the underlying acidic PEDOT:PSS layer from moisture-related degradation and works as an intermediary layer to facilitate the growth of significantly larger perovskite grains; these enlarged grains are indicative of enhanced crystallinity and fewer grain boundaries in the perovskite layer. The fewer grain boundaries lead to suppression of interfacial defects and result in enhanced charge collection at the hole transport layer/perovskite interface, thus improving the open-circuit voltage up to 0.85 V and fill factor up to ≈78%, eventually boosting the power conversion efficiency of the champion cell up to 19.08%. Herein, a simple interface engineering route to fabricate efficient and stable Pb–Sn-mixed LBG perovskite solar cells is offered.
KW - PTAA
KW - Pb–Sn-mixed perovskites
KW - grain growth
KW - hole-selective layer modifications
KW - interface passivation
KW - low-bandgap perovskites
KW - stability improvements
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U2 - 10.1002/solr.202100945
DO - 10.1002/solr.202100945
M3 - Article
AN - SCOPUS:85123483415
SN - 2367-198X
VL - 6
JO - Solar RRL
JF - Solar RRL
IS - 4
M1 - 2100945
ER -