Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 19, Pages 16627-16634Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b01766
Keywords
CNT-Si hybrid junctions; carbon nanotubes; solar cell; transient spectroscopy; interface states; J-V characteristics; photoemission
Funding
- University Cattolica del Sacro Cuore [D.2.2]
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Despite the astonishing values of the power conversion efficiency readied, in just less than a decade, by the carbon nanotube/silicon (CNT/Si) solar cells, many doubts remain on the underlying transport mechanisms across the CNT/Si heterojunction. Here, by combining transient optical spectroscopy in the femtosecond timescale, X-ray photo emission, and a systematic tracking of I-V curves across all phases of the interlayer SiOx growth at the interface, we grasp the mechanism that adequately preserves charge separation at the junction, hindering the photoexcited carrier recombination. Moreover, supported by ab initio calculations aimed to model the complex CNT-Si heterointerface, we show that oxygen related states at the interface act as entrapping centers for the photoexcited electrons, thus preventing recombination with holes that can flow from Si to CNT across the SiOx layer.
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