Journal
ACS NANO
Volume 16, Issue 8, Pages 11902-11911Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c01547
Keywords
perovskite solar cells; interfacial layer; energy level alignment; nonradiative recombination; stability
Categories
Funding
- Guangdong Basic and Applied Basic Research Foundation [2021A151- 5011640]
- Shenzhen Basic Research Fund [JCYJ20180504165709042, JCYJ20190809162003662]
- National Natural Science Foundation of China [21774055, 22005135]
- Department of Science and Technology of Guangdong Province [2021B1212040001]
- Center for Computational Science and Engineering at Southern University of Science and Technology (SUSTech)
- Center for Computational Science and Engineering at Southern University of Science and Technology (SUSTech)
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Nonradiative recombination caused by interface defects and nonoptimal energy level alignment is a major limitation for the performance improvement of perovskite solar cells. Introducing interfacial materials with imide and thiadiazole groups can effectively suppress nonradiative recombination and enhance the efficiency of PSCs.
Charge carrier nonradiative recombination (NRR) caused by interface defects and nonoptimal energy level alignment is the primary factor restricting the performance improvement of perovskite solar cells (PSCs). Interfacial modification is a vital strategy to restrain NRR and enable high-performance PSCs. We report here two interfacial materials, PhI-TPA and BTZI-TPA, consisting of phthalimide and a 2,1,3-benzothiadiazole-5,6-dicarboxylicimide core, respectively. The difunctionalized BTZI-TPA with imide and thiadiazole shows higher hole mobility, better aligned energy levels, and stronger interaction with uncoordinated Pb2+ on the perovskite surface, suppressing NRR and carrier accumulation at the interface of perovskite/spiro-OMeTAD and yielding enhanced open-circuit voltage and fill factor. Consequently, the PSC based on BTZI-TPA delivers a high efficiency of 24.06% with an excellent fill factor of 83.10%, superior to that (21.47%) of the reference cell without an interfacial layer, and 21.45% efficiency for the device with a scaled-up area (1.00 cm(2)). These results underscore the potential of imide and thiadiazole groups in developing interfacial layers with strong passivation capability, effective charge transport property, and fine-tuned energetics for stable and efficient PSCs.
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