journal article·2024-12Open access

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

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

Advanced Materials· Volume 36· Issue 49

Abstract

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 x /SAM interface and the thorough control of the MoO x 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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Research context

OpenAlex topics: Perovskite Materials and Applications · Organic Electronics and Photovoltaics · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry City University of Hong Kong Kowloon 999077 Hong Kong

CAS Key Laboratory of Materials for Energy Conversion Anhui Laboratory of Advanced Photon Science and Technology Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China

Department of Materials Science and Engineering City University of Hong Kong Kowloon 999077 Hong Kong

Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Intense Laser Application Technology (iLaT) and College of Engineering Physics Shenzhen Technology University Shenzhen 518118 China

Electronic Engineering Department The Chinese University of Hong Kong Shatin, N.T Hong Kong, SAR 999077 Hong Kong

Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon 999077 Hong Kong

State Key Laboratory of Advanced Displays and Optoelectronics Technologies The Hong Kong University of Science and Technology Clear Water Bay Kowloon 999077 Hong Kong

Shenzhen Research Institute City University of Hong Kong Shenzhen 518057 China

Funding

National Key Research and Development Program of China · Innovation and Technology Fund · National Natural Science Foundation of China · Ministry of Science and Technology of the People's Republic of China

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