Journal
CHEMICAL ENGINEERING JOURNAL
Volume 392, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123677
Keywords
Interface engineering; Recombination loss; Electron transport material; Perovskite solar cell
Categories
Funding
- National Key R&D Program of China [2018YFC0910602]
- National Natural Science Foundation of China [61775145, 61525503, 61620106016, 61835009, 81727804]
- China Postdoctoral Science Foundation [2018M643147]
- (Key) Project of Department of Education of Guangdong Province [2015KGJHZ002, 2016KCXTD007]
- Guangdong Natural Science Foundation Innovation Team [2014A030312008]
- Shenzhen Basic Research Project [JCYJ20170412110212234, JCYJ20160328144746940, JCYJ20170412105003520]
- Science, Technology and Innovation Committee of Shenzhen Municipality [JCYJ20180507183413211]
- Hong Kong Research Grants Council [PolyU 123384/16P, C5037-18G]
- Hong Kong Polytechnic University [1-ZE1C]
- [847S]
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Fullerene derivatives are promising electron transporting materials for low-temperature processed inverted perovskite solar cells (PSCs). However, fullerene derivatives have some disadvantages, e.g. [6,6]-phenyl C-61 butyric acid methyl ester (PCBM) has unmanageable morphology, low electron mobility and easily generated non-radiative recombination, which restrict the performance of PSCs. Herein, a novel n-type small organic molecule, homologous perylene diimide tetramer (HPDT), is designed and synthesized in this work to engineer the interface properties by enhancing interface contact, decreasing energetic barrier and recombination losses. HPDT shows suitable energy levels and high electron mobility and thus will increase the electron mobility during interface engineering in the inverted PSCs. Moreover, coating HPDT on top of perovskite prior to the deposition of PCBM is helpful to achieve a homogeneous pinhole-free PCBM layer, leading to enhanced power conversion efficiency from 17.38% up to 19.75% for inverted MAPbI(3) PSCs along with a negligible hysteresis. Significantly, our results undoubtedly provide new guidelines in exploring n-type organic small molecules for high-performance PSCs.
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