Optimization of Charge Extraction and Interconnecting Layers for Highly Efficient Perovskite/Organic Tandem Solar Cells with High Fill Factor

Perovskite/organic tandem solar cells (POTSCs) have garnered significant attention due to their potential for achieving high photovoltaic (PV) performance. However, the reported power conversion efficiencies (PCEs) and fill factors (FFs) are still subpar due to the challenges associated with charge extraction in the organic bulk-heterojunction (BHJ) and significant energy losses in the interconnecting layers (ICLs). Here, a quaternary organic BHJ blend is developed to enhance the charge extraction in the organic subcell, contributing to an increased FF of ≥78% under 1 sun illumination and even more under lower illumination intensities. Meanwhile, energy losses in the ICLs are reduced via the incorporation of a self-assembly monolayer (SAM), (4-(3,6-Dimethyl-9H-carbazol-9-yl)butyl)phosphonic acid (Me-4PACz), in organic BHJ to form a MoO<sub>x</sub>/SAM interface and the thorough control of the MoO<sub>x</sub> thickness to suppress parasitic absorption. The resultant POTSCs achieve a remarkable PCE of 25.56% (certified: 24.65%), with a record FF of 83.62%, which is among the highest PCEs of POTSCs and the highest FF of all types of perovskite-based tandem solar cells (TSCs) till now. This work proves the optimization of charge extraction and ICLs are effective strategies to promote the performance of POTSCs to surpass other solution-processed perovskite-based TSCs in the near future.

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Publication Details

Journal
Advanced Materials
Published
2024-09-23
DOI
https://doi.org/10.1002/adma.202410692
Citations
40
Primary Topic
Perovskite Materials and Applications
Type
article
Field-Weighted Citation Impact
8.35

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Optimization of Charge Extraction and Interconnecting Layers for Highly Efficient Perovskite/Organic Tandem Solar Cells with High Fill Factor

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article

Optimization of Charge Extraction and Interconnecting Layers for Highly Efficient Perovskite/Organic Tandem Solar Cells with High Fill Factor

Shuang Xiao, Xiao Cheng Zeng, Shangfeng Yang, Baoze Liu, Martin Stolterfoht, Danpeng Gao, Zonglong Zhu, Xintong Li, Nan Li, Dong Zhang, Xue Wang, Qi Liu, Zexin Yu, Yen‐Hung Lin, Xin Wu, Bo Li, Ning Wang, Lina Wang, Yan Wang
article en
40 citations

Abstract

Perovskite/organic tandem solar cells (POTSCs) have garnered significant attention due to their potential for achieving high photovoltaic (PV) performance. However, the reported power conversion efficiencies (PCEs) and fill factors (FFs) are still subpar due to the challenges associated with charge extraction in the organic bulk-heterojunction (BHJ) and significant energy losses in the interconnecting layers (ICLs). Here, a quaternary organic BHJ blend is developed to enhance the charge extraction in the organic subcell, contributing to an increased FF of ≥78% under 1 sun illumination and even more under lower illumination intensities. Meanwhile, energy losses in the ICLs are reduced via the incorporation of a self-assembly monolayer (SAM), (4-(3,6-Dimethyl-9H-carbazol-9-yl)butyl)phosphonic acid (Me-4PACz), in organic BHJ to form a MoO<sub>x</sub>/SAM interface and the thorough control of the MoO<sub>x</sub> thickness to suppress parasitic absorption. The resultant POTSCs achieve a remarkable PCE of 25.56% (certified: 24.65%), with a record FF of 83.62%, which is among the highest PCEs of POTSCs and the highest FF of all types of perovskite-based tandem solar cells (TSCs) till now. This work proves the optimization of charge extraction and ICLs are effective strategies to promote the performance of POTSCs to surpass other solution-processed perovskite-based TSCs in the near future.

Advanced MaterialsVol. 36(49)
University of Science and Technology of China (CN), City University of Hong Kong (HK), Chinese University of Hong Kong (HK), Hong Kong University of Science and Technology (HK), City University of Hong Kong, Shenzhen Research Institute (CN), Shenzhen Technology University (CN), University of Hong Kong (HK)
City University of Hong Kong, Shenzhen Technology University, National Natural Science Foundation of China, Ministry of Science and Technology of the People's Republic of China, Chinese University of Hong Kong, Innovation and Technology Fund, National Key Research and Development Program of China
Affordable and clean energy
Openalex Percentile: Top 2%
Perovskite Materials and Applications
8.35
DOIOpen Access PDFOpenAlex
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