Journal
NANO ENERGY
Volume 78, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105249
Keywords
Inverted perovskite solar cells; Non-radiative recombination; Functional molecules; Interface engineering
Categories
Funding
- EPSRC [EP/R043272/1]
- Newton Advanced Fellowship [192097]
- China Scholarship Council (CSC) [201706020158]
- European Commission H2020 CORNET program [760949]
- Equal Opportunities Foundation Hong Kong
- EPSRC (UK) [EP/N021037/1]
- National Key Research and Development Program of China [2019YFB1503500]
- State Key Laboratory of Metastable Materials Science and Technology [201901]
- Fujian Key Laboratory of Photoelectric Functional Materials [FJPFM-201902]
- University of Surrey Doctoral College DCSA3 Award
- Zhengzhou Materials Genome Institute
- Marie Sklodowska-Curie Actions Individual Fellowships [839136]
- Marie Curie Actions (MSCA) [839136] Funding Source: Marie Curie Actions (MSCA)
- EPSRC [EP/R043272/1, EP/N021037/1] Funding Source: UKRI
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Interface-mediated recombination losses between perovskite and charge transport layers are one of the main reasons that limit the device performance, in particular for the open-circuit voltage (VOC) of perovskite solar cells (PSCs). Here, functional molecular interface engineering (FMIE) is employed to retard the interfacial recombination losses. The FMIE is a facile solution-processed means that introducing functional molecules, the fluorenebased conjugated polyelectrolyte (CPE) and organic halide salt (OHS) on both contacts of the perovskite absorber layer. Through the FMIE, the champion PSCs with an inverted planar heterojunction structure show a remarkable high V-OC of 1.18 V whilst maintaining a fill factor (FF) of 0.83, both of which result in improved power conversion efficiencies (PCEs) of 21.33% (with stabilized PCEs of 21.01%). In addition to achieving one of the highest PCEs in the inverted PSCs, the results also highlight the synergistic effect of these two molecules in improving device performance. Therefore, the study provides a straightforward avenue to fabricate highly efficient inverted PSCs.
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