Journal
MOLECULAR SYSTEMS DESIGN & ENGINEERING
Volume 3, Issue 5, Pages 717-722Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8me00036k
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- Laboratory of Photonics and Interfaces (LPI) at Ecole Polytechnique Federale de Lausanne (EPFL)
- School of Engineering at the Hong Kong University of Science and Technology
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The improvement of the quality of the hole transporting layer (HTL) plays a key role in the fabrication of highly efficient and stable perovskite solar cells (PSCs). Here, we used rubrene as a surface treatment agent on top of a spiro HTL. We found that rubrene can cover the pinholes of the spiro layer and provide an excellent contact layer for planar PSCs. Based on this modification, mobile gold ions from the metal electrode are prevented from diffusing through the HTL hindering the degradation of PSCs. The optimized device shows a maximum power conversion efficiency (PCE) of 19.87% and a 79% fill factor (FF), which are higher than the 17.98% PCE and 72% FF of the reference device. In addition, the device after modification demonstrates better stability after 100 h under continuous light illumination retaining 97% of its initial performance compared with 65% of the reference device.
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