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

doi:10.1002/adma.202410692

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

Adv Mater. 2024 Sep 23:e2410692. doi: 10.1002/adma.202410692. Online ahead of print.

Authors

Xin Wu¹, Dong Zhang¹, Baoze Liu¹, Yan Wang¹, Xue Wang², Qi Liu³, Danpeng Gao¹, Ning Wang¹, Bo Li¹, Lina Wang¹, Zexin Yu¹, Xintong Li¹, Shuang Xiao⁴, Nan Li³, Martin Stolterfoht⁵, Yen-Hung Lin^{6

7}, Shangfeng Yang², Xiao Cheng Zeng³, Zonglong Zhu^{1

8}

Affiliations

¹ Department of Chemistry, City University of Hong Kong, Kowloon, 999077, Hong Kong.
² 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.
³ Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, 999077, Hong Kong.
⁴ 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.
⁵ Electronic Engineering Department, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong, SAR, 999077, Hong Kong.
⁶ Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, 999077, Hong Kong.
⁷ State Key Laboratory of Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, 999077, Hong Kong.
⁸ Shenzhen Research Institute, City University of Hong Kong, Shenzhen, 518057, China.

PMID: 39313988
DOI: 10.1002/adma.202410692

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.

Keywords: charge extraction; interconnecting layer; performance; perovskite/organic tandem solar cells; stability.

Abstract

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