Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 35, Pages 16868-16873Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta06081a
Keywords
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Funding
- National Natural Science Foundation of China [51703183]
- Fundamental Research Funds for the Central Universities [XDJK2017A002]
- Program for Innovation Team Building at Institutions of Higher Education in Chongqing [CXTDX201601011]
- ShenZhen Technology and Innovation Commission [JCYJ20170413173814007]
- Hong Kong Research Grants Council [T23-407/13 N, N_HKUST623/13, 16305915, 16322416, 606012, 16303917]
- HK JEBN Limited
- HKUST president's office (Project FP201)
- National Science Foundation of China [21374090]
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A 3D type perylenediimide (PDI)-based molecule (TPE-PDI4) is successfully applied as an efficient electron transporting material in inverted perovskite solar cells (PSCs). TPE-PDI4 has been previously demonstrated as an excellent non-fullerene electron acceptor in high-performance bulk-heterojunction polymer solar cells. Considering its decent electron mobility and outstanding solution processability with favorable thin-film morphology, as well as compatible energy levels with perovskite materials, TPE-PDI4 serves as a promising candidate as the electron transport layer (ETL) material for perovskite solar cells. Herein, we report the fabrication of inverted perovskite solar cells using TPE-PDI4 as the electron transporting layer. A high PCE of 16.29% is obtained, which is higher than that obtained using a PCBM-based electron transporting layer under the same testing conditions. On the other hand, TPE-PDI4 also works well as an interfacial layer between perovskite and C60. A high efficiency of 18.78% is achieved in PSCs with TPE-PDI4 compared to a lower efficiency of 16.56% without this interlayer, indicating an enhanced charge transport/collection with the insertion of TPE-PDI4. Additionally, TPE-PDI4 shows a better water-resistibility than PCBM, which could more effectively protect the perovskite layer beneath. Therefore, devices with a TPE-PDI4-based ETL exhibit an enhanced stability. Our results demonstrate the great potential of TPE-PDI4 to replace expensive fullerene-based ETLs.
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