journal article·2023-02

Regulating Charge Carrier Recombination in the Interconnecting Layer to Boost the Efficiency and Stability of Monolithic Perovskite/Organic Tandem Solar Cells

Haidi Yang, Weijie Chen, Yuan Yu, Yunxiu Shen, Heyi Yang, Xinqi Li, Ben Zhang, Haiyang Chen, Qinrong Cheng, Zhichao Zhang, Wei Qin, Jing‐De Chen, Jian‐Xin Tang, Yaowen Li, Yongfang Li

Advanced Materials· Volume 35· Issue 6
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Abstract

Abstract The charge carriers of single‐junction solar cells can be fluently extracted and then collected by electrodes, leading to weak charge carrier accumulation and low energy loss (Eloss). However, in tandem solar cells (TSCs), it is a considerable challenge to obtain a balance between the densities of the holes and electrons extracted from the two respective subcells to facilitate an efficient recombination in the interconnecting layer (ICL). Herein, a charge‐carrier‐dynamic management strategy for inorganic perovskite/organic TSCs is proposed, centered on the simultaneous regulation of the defect states of CsPbI1.9Br1.1 perovskite in the front subcell and hole transport ability from the perovskite to ICL. The target hole density on the perovskite surface and the hole loss before reaching the ICL are significantly improved. As a result, the hole/electron density offset in the ICL can be effectively narrowed, leading to a balanced charge carrier recombination, which reduces the Eloss in TSCs. The resulting inorganic perovskite/organic 0.062‐cm2 TSC exhibits a remarkable power conversion efficiency (PCE) of 23.17% with an ultrahigh open‐circuit voltage (Voc) of 2.15 V, and the PCE of the 1.004‐cm2 device (21.69%) exhibited a weak size‐dependence. This charge‐carrier‐dynamic management strategy can also effectively enhance the operational and ultraviolet‐light stabilities of the TSCs.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Chalcogenide Semiconductor Thin Films · Conducting polymers and applications

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

Affiliations

Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor‐optoelectronics Materials and Devices College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 P. R. China

School of Microelectronics Shandong University Jinan 250100 P. R. China

School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 P. R. China

Jiangsu Key Laboratory for Carbon‐Based Functional Materials & Devices Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou Jiangsu 215123 P. R. China

Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University Suzhou Jiangsu 215123 P. R. China

State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 P. R. China

Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China

Funding

National Natural Science Foundation of China · National Key Research and Development Program of China · Priority Academic Program Development of Jiangsu Higher Education Institutions · National Postdoctoral Program for Innovative Talents · Collaborative Innovation Center of Suzhou Nano Science and Technology · China Postdoctoral Science Foundation

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