Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 40, Pages 34821-34832Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b08489
Keywords
perovskite solar cells; Au nanoparticles; exciton generation; exciton dissociation; plasmon enhancement; near-field
Funding
- National Natural Science Foundation of China [11274119, 61275038]
- Large Instruments Open Foundation of East China Normal University
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We report systematic design and formation of plasmonic perovskite solar cells (PSCs) by integrating Au@TiO2 core-shell nanoparticles (NPs) into porous TiO2 and/or perovskite semiconductor capping layers. The plasmonic effects in the formed PSCs are examined. The most efficient configuration is obtained by incorporating Au@TiO2 NPs into both the porous TiO2 and the perovskite capping layers, which increases the power conversion efficiency (PCE) from 12.59% to 18.24%, demonstrating over 44% enhancement, compared with the reference device without the metal NPs. The PCE enhancement is mainly attributed to short-circuit current improvement. The plasmonic enhancement effects of Au@TiO2 core shell nanosphere photovoltaic composites are explored based on the combination of UV vis absorption spectroscopy, external quantum efficiency (EQE), photocurrent properties, and photoluminescence (PL). The addition of Au@TiO2 nanospheres increased the rate of exciton generation and the probability of exciton dissociation, enhancing charge separation/transfer, reducing the recombination rate, and facilitating carrier to understanding of plasmonic effects in perovskite solar cells and also provides a energy and electron management. transport in the device. This study contributes promising approach for simultaneous photon energy and electron management.
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