Journal
ADVANCED MATERIALS
Volume 31, Issue 35, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201902781
Keywords
device stability; donor-acceptor small molecules; dopant-free hole-transporting materials; inverted perovskite solar cells
Categories
Funding
- China Postdoctoral Science Foundation [2018M630267]
- National Natural Science Foundation of China [61775091, 21805128, 21801124, 51573076]
- SUSTech Presidential Postdoctoral Fellowship
- Shenzhen Basic Research Fund [JCYJ20170817105905899]
- Natural Science Foundation of Shenzhen Innovation Committee [JCYJ20180504165851864]
- Shenzhen Key Laboratory Project [ZDSYS201602261933302]
- Shenzhen Innovation Committee [JCYJ20170818141216288]
- Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong
- NRF of Korea [2016M1A2A2940911, 2015M1A2A2057506]
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Hole-transporting materials (HTMs) play a critical role in realizing efficient and stable perovskite solar cells (PVSCs). Considering their capability of enabling PVSCs with good device reproducibility and long-term stability, high-performance dopant-free small-molecule HTMs (SM-HTMs) are greatly desired. However, such dopant-free SM-HTMs are highly elusive, limiting the current record efficiencies of inverted PVSCs to around 19%. Here, two novel donor-acceptor-type SM-HTMs (MPA-BTI and MPA-BTTI) are devised, which synergistically integrate several design principles for high-performance HTMs, and exhibit comparable optoelectronic properties but distinct molecular configuration and film properties. Consequently, the dopant-free MPA-BTTI-based inverted PVSCs achieve a remarkable efficiency of 21.17% with negligible hysteresis and superior thermal stability and long-term stability under illumination, which breaks the long-time standing bottleneck in the development of dopant-free SM-HTMs for highly efficient inverted PVSCs. Such a breakthrough is attributed to the well-aligned energy levels, appropriate hole mobility, and most importantly, the excellent film morphology of the MPA-BTTI. The results underscore the effectiveness of the design tactics, providing a new avenue for developing high-performance dopant-free SM-HTMs in PVSCs.
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