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Vol. 18 (2026)

Perovskite/Organic Tandem Solar Cells with 26.49% Efficiency via Enhanced Absorption and Minimized Energy Losses

https://doi.org/10.1007/s40820-025-02037-z
Bing Guo
State Key Laboratory and Institute of Elemento‑Organic Chemistry, Frontiers Science Center for New Organic Matter, Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, People’s Republic of China
Jiaqi Li
State Key Laboratory and Institute of Elemento‑Organic Chemistry, Frontiers Science Center for New Organic Matter, Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, People’s Republic of China
Ruihan Wu
CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, People’s Republic of China
Haozhe He
CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, People’s Republic of China
Senyao Wang
CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, People’s Republic of China
Longyu Li
State Key Laboratory and Institute of Elemento‑Organic Chemistry, Frontiers Science Center for New Organic Matter, Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, People’s Republic of China
Wenkai Zhao
School of Materials Science and Engineering, National Institute for Advanced Materials, Renewable Energy Conversion and Storage Center (RECAST), Nankai University, Tianjin, People’s Republic of China
Jinyuan Zhang
CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, People’s Republic of China
Lei Meng
CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, People’s Republic of China
Guankui Long
School of Materials Science and Engineering, National Institute for Advanced Materials, Renewable Energy Conversion and Storage Center (RECAST), Nankai University, Tianjin, People’s Republic of China
Zhaoyang Yao
State Key Laboratory and Institute of Elemento‑Organic Chemistry, Frontiers Science Center for New Organic Matter, Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, People’s Republic of China
Xiangjian Wan
State Key Laboratory and Institute of Elemento‑Organic Chemistry, Frontiers Science Center for New Organic Matter, Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, People’s Republic of China
Yongfang Li
CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, People’s Republic of China
Yongsheng Chen
State Key Laboratory and Institute of Elemento‑Organic Chemistry, Frontiers Science Center for New Organic Matter, Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, People’s Republic of China

Corresponding Author: Yongsheng Chen

yschen99@nankai.edu.cn

Nano-Micro Letters, Vol. 18 (2026), Article Number: 186

Abstract

Although perovskite/organic tandem solar cells have many advantages, their power conversion efficiency (PCE) still substantially lags behind their perovskite/perovskite counterparts. One of the main reasons is the low external quantum efficiency and high energy loss of the rear subcell. In this work, guided by the semi-empirical analysis, the most suitable available material combination has been obtained. To further improve the photovoltaic performance of the organic rear cells, isopropanol has been used as a co-solvent additive to finely tune the bulk heterojunction morphology of the active layer. Together with the optimization of each subcell, a remarkable PCE of 26.49% (certified 25.56%) with a high open-circuit voltage of 2.214 V has been achieved for the perovskite/organic tandem device.


Highlights:
1 A semi-empirical analysis is performed to select the best matchable perovskite front and organic rear cell materials for tandem solar cells.
2 Isopropanol is introduced as a co-solvent additive to precisely modulate the bulk heterojunction morphology of the active layer in the rear cell.
3 The resulting perovskite/organic tandem solar cells achieve a notable power conversion efficiency of 26.49% (certified 25.56%), along with a high open-circuit voltage of 2.214 V.

Keywords

Perovskite/organic tandem solar cells Morphology Solvent additive
Guo, Bing, Jiaqi Li, Ruihan Wu, Haozhe He, Senyao Wang, Longyu Li, Wenkai Zhao, Jinyuan Zhang, Lei Meng, Guankui Long, Zhaoyang Yao, Xiangjian Wan, Yongfang Li, and Yongsheng Chen. 2026. “Perovskite/Organic Tandem Solar Cells With 26.49% Efficiency via Enhanced Absorption and Minimized Energy Losses”. Nano-Micro Letters 18 (January):186. https://doi.org/10.1007/s40820-025-02037-z.
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