Bias-free solar to ammonia production via integrated perovskite-organic tandem photovoltaics.

Authors

Wangyeon Lee, Dong Hyun Shin, Hak-Beom Kim, Woojin Lee, Jongdeuk Seo, Yuri Kim, Wonju Na, Su-Yeong Choe, Uk-Jin Choi, Jina Roe, Ha-Eun Koo, Jung Geon Son, Jae Yong Park, Woo Jin Byun, Heunjeong Lee, Shinuk Cho, Ji-Wook Jang, Dong Suk Kim, Ji-Youn Seo, Tack Ho Lee, Jin Young Kim, Jaeki Jeong

Published in

Nanoscale. Jul 20, 2026. Epub Jul 20, 2026.

Abstract

Perovskite/organic tandem solar cells (PO-TSCs) offer high photovoltage and solution processability, making them attractive power sources for bias-free photovoltaic-electrochemical (PV-EC) conversion. However, their integration into PV-EC systems requires minimizing interfacial losses and ensuring stable charge extraction at selective contacts. Herein, we report a simplified interfacial engineering strategy by incorporating Al₂O₃ into a MeO-4PACz self-assembled monolayer to form a mixed hole-selective layer (m-HSL) via a single-step deposition process. The resulting PO-TSC attains a power conversion efficiency of 22.85% with an exceptional open-circuit voltage (V_OC) of 2.13 V. Exploiting this exceptional photovoltage, we directly couple the PO-TSC with a two-electrode nitrate electrolyzer to realize solar-driven nitrate-to-ammonia conversion without an external bias. The integrated device achieves a solar-to-ammonia efficiency of 3.7% with a faradaic efficiency of 82%. This work establishes a robust tandem-driven PV-EC framework for nitrate reduction and provides a foundation for solar-driven ammonia production.

PMID:
42475153
Bibliographic data and abstract were imported from PubMed on 20 Jul 2026.

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