Journal
ACS ENERGY LETTERS
Volume 6, Issue 1, Pages 208-215Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c02210
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Funding
- China Scholarship Council
- King Abdulaziz City for Science and Technology (KACST)
- European Union's Horizon 2020 research and innovation program [826013]
- National Science Foundation of China [21676188]
- National Key Research and Development Program of China [2016YFB0401303]
- National Science Foundation for Young Scientists of China [61804106]
- Swiss National Science Foundation R'Equip program [183305]
- H2020 Societal Challenges Programme [826013] Funding Source: H2020 Societal Challenges Programme
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Developing a novel pyramid-shaped, low-cost HTM MeOTTVT with extended conjugation has improved charge transport efficiency and stability, resulting in high-performance PSCs. The molecular configuration of MeOTTVT facilitates hole transport and exhibits outstanding stability, making it a promising material for commercialization.
Developing hole-transporting materials (HTMs) with appropriate molecular configuration and charge mobility is important to improve perovskite solar cell (PSC) photovoltaic performance and their feasibility for commercialization. In this work, a novel pyramidal-shaped low-cost HTM coded MeOTTVT is prepared through extension of pi-conjugation based on a triphenylamine core. Carbon-carbon double bonds are introduced between the core and p-methoxyl triphenylamine to improve the planarity of the HTM, favoring intermolecular stacking of MeOTTVT and thus improving the hole mobility of the corresponding hole-transporting layer (HTL). The p-methoxyl triphenylamine-endowed HTM benefits from a highest occupied molecular orbital level well-aligned with the perovskite active layer, facilitating effective hole extraction. The champion PSC using an MeOTTVT-based dopant additive-free HTL yielded a power conversion efficiency (PCE) up to 21.30%, which is considered one of the best-performing PSCs employing a dopant additive-free small molecule HTM. In addition, the MeOTTVT-based dopant additive-free HTL exhibits outstanding thermal stability and high glass-transition temperature (T-g = 137.1 degrees C), combined with a more hydrophobic surface; PSCs based on an MeOTTVT dopant additive-free HTL exhibit outstanding stability against moisture, 1 sun illumination, and thermal stress.
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