CHEMICAL SCIENCE

Professor Yang Shangfeng of the University of Science and Technology of China: Fullerene interface layer synergistic passivation defect helps all-inorganic perovskite solar cells


May 16, 2023, University of Science and Technology of ChinaYang ShangfengThe new journal published by the professor’s team at Tsinghua UniversityNano Research EnergyPublished the latest research results of perovskite solar cells entitled “Synchronous defect passivation of all-inorganic perovskite solar cells enabled by fullerene interlayer”.

CsPbI3-xBrx all-inorganic perovskiteBecause of its excellent thermal stability, it is expected to meet the requirements of high efficiency and stability required for the commercialization of perovskite cells at the same time, and has received extensive attention from researchers in recent years. However, the efficiency of fully inorganic perovskite solar cells lags behind that of organic-inorganic hybrid perovskites, largely due to CsPbI3-xBrx all-inorganic perovskitesThe density of defect states is high。 For CsPbI3-xBrx all-inorganic perovskite solar cells, ZnO is widely used in the electron transport layer due to its high conductivity and matching energy levels. However, ZnO is prone to defects such as oxygen vacancies, which reduce the energy conversion efficiency and environmental stability of CsPbI3-xBrx perovskite solar cells. Therefore, it is urgent to develop suitable strategies to effectively passivate the defects of the CsPbI3-xBrx perovskite layer and ZnO electron transport layer.

Figure 1: Synergistic defect passivation of ZnO and CsPbI2.25Br0.75 by the fullerene derivative PCBDMAM.

In view of the above problems, Professor Yang Shangfeng’s team synthesized dimethylaminomodified fullerene derivatives (PCBDMAM) and used them as the interface layer between the ZnO electron transport layer and the fully inorganic CsPbI2.25Br0.75 perovskite layer, successfully realizing the defects of the two layers of ZnO and CsPbI2.25Br0.75 perovskite, which significantly improved the efficiency and thermal stability of the device. Grafted methylaminofunctional groups on PCBDMAM can passivate oxygen vacancy defects on ZnO by forming Zn-N ion bonds. At the same time, PCBDMAM effectively passivates the PbI and IPb inversion defects in the perovskite layer by forming a coordination bond with Pb2+ in CsPbI2.25Br0.75 all-inorganic perovskite. Based on this defect synergistic passivation strategy, CsPbI2.25Br0.75 all-inorganic perovskite solar cells with planar structure were obtained17.04%Energy conversion efficiency, and in the N2 atmosphere85 ℃under thermal stability testing600 hAfter that, the initial efficiency can still be maintained80%。 The fullerene derivative defect synergistic passivation strategy provides a new idea for the development of fully inorganic perovskite solar cells with higher efficiency and stability.

Related paper information:

Y.Shang, P. Wang, et al. Synchronous defect passivation of all-inorganic perovskite solar cells enabled by fullerene interlayer. Nano Research Energy, 2023, https://doi.org/10.26599/NRE.2023.9120073.

doi: 10.26599/NRE.2023.9120073

Nano Research Energy is a companion journal of Nano Research, (ISSN: 2791-0091; e-ISSN: 2790-8119; Official Website: https://www.sciopen.com/journal/2790-8119Founded in June 2022, Professor Qu Liangti of Tsinghua University and Professor Chunyi Zhi of City University of Hong Kong serve as editors-in-chief.Nano Research EnergyIt is an international multidisciplinary and English-based open access journal, focusing on the cutting-edge research and application of nanomaterials and nanoscience and technology in new energy-related fields, benchmarking against top international energy journals, and committed to publishing high-level original research and review papers, which has been selected2022 China Science and Technology Journals Excellence Action Plan – High Starting Point New Journal Project。 APC fees will be waived until 2025, and teachers are welcome to submit their papers.

To submit, please contact:

NanoResearchEnergy@tup.tsinghua.edu.cn

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