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Enhanced reproducibility of planar perovskite solar cells by fullerene doping with silver nanoparticles

2018; American Institute of Physics; Volume: 124; Issue: 6 Linguagem: Inglês

10.1063/1.5036643

1520-8850

Marissa Higgins, Fernando Ely, R.C. Nome, René A. Nome, Diego P. dos Santos, Hyunjoo Choi, Seungjin Nam, Manuel Quevedo-López,

Chalcogenide Semiconductor Thin Films

A small cross-section of silver nanoparticles (AgNPs) placed at the rear-part of the solar cell avoids the parasitic absorption of the nanoparticles which is the biggest barrier for plasmonic structures when acting as photocurrent enhancers. Herein, we demonstrate p-i-n planar perovskite solar cells with the structure ITO/PEDOT:PSS/MAPbI3/PCBM/Ni:Au, where the PCBM electron extraction layer (EEL) was intentionally modified with variable amounts of AgNPs. The addition of small amounts of AgNPs (e.g., 5 wt. %) into the PCBM improved the overall reproducibility and reliability of the solar cell fabrication process after optimization. Plasmonic simulations suggest that any plasmonic-optical effects are relatively small compared to sample absorbance due to perovskite alone. It has been concluded that plasmonic-electrical effects play a major role in averaged performance improvement. Therefore, the addition of small AgNPs in low concentration to the EEL layer accounts for higher Jsc, Voc and FF as a result of a better perovskite coverage by the EEL and an improved charge carrier collection as evidenced by morphological and electrical analysis.