Dopant-Free Hole Transport Materials Based on a Large Conjugated Electron-Deficient Core for Efficient Perovskite Solar Cells
Article
Article Title | Dopant-Free Hole Transport Materials Based on a Large Conjugated Electron-Deficient Core for Efficient Perovskite |
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ERA Journal ID | 1397 |
Article Category | Article |
Authors | Hai, Jiefeng (Author), Wu, Hao (Author), Yin, Xinxing (Author), Song, Jiaxing (Author), Hu, Lin (Author), Jin, Yingzhi (Author), Li, Ling (Author), Su, Zhen (Author), Xu, Zhiguang (Author) and Wang, Hao (Author) |
Journal Title | Advanced Functional Materials |
Journal Citation | 31 (51), pp. 1-8 |
Article Number | 2105458 |
Number of Pages | 8 |
Year | 2021 |
Publisher | John Wiley & Sons |
Place of Publication | Germany |
ISSN | 1616-301X |
1616-3028 | |
Digital Object Identifier (DOI) | https://doi.org/10.1002/adfm.202105458 |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.202105458 |
Abstract | Hole transport materials (HTMs) play a significant role in device efficiencies and long-term stabilities of perovskite solar cells (PSCs). In this work, two simple dopant-free HTMs are designed with a large conjugated electron-deficient core. On the one hand, a large coplanar backbone endows enhanced π–π stacking and reduced hole hopping distance. On the other hand, the incorporation of electron-deficient unit can easily tune the energy levels as well as increase hole mobilities. Combining these two advantages together, 12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro[1,2,5]thiadiazole[3,4-e]thieno[2″,3″:4,5]thieno[2′,3′:4,5]pyrrolo[3,2-g]thieno[2′,3′:4,5]thieno[3,2-b]indole is chosen as the large electron-deficient core to construct two novel dopant-free HTMs, Y6-T and Y-T. Both Y6-T and Y-T behave suitable highest occupied molecular orbital levels, good hole mobilities, as well as strong hydrophobicities. After careful device optimization with a passivation agent, Y-T delivers an impressive power conversion efficiency of 20.29%, which is higher than that of Y6-T (18.82%) and doped spiro-OMeTAD (19.24%). Moreover, PSCs based on Y6-T and Y-T show much better long-term stabilities than spiro-OMeTAD due to the intrinsic hydrophobicity. Therefore, this work provides a promising candidate as well as a useful design strategy for exploring dopant-free HTMs, which may pave the way for the commercialization of PSCs. |
Keywords | dopant-free; electron-deficient core; hole transport materials; perovskite solar cells |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Byline Affiliations | Guilin University of Technology, China |
Jiaxing University, China | |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6zv9/dopant-free-hole-transport-materials-based-on-a-large-conjugated-electron-deficient-core-for-efficient-perovskite-solar-cells
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