期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 8, 页码 1445-1449出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz500344s
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资金
- KAUST CRG grant
First-principles calculations are performed to explore the geometry, bonding, and electronic structures of six ultrathin photovoltaic heterostructures consisting of pristine and B- or N-doped fullerenes and MoS2 or WS2 monolayers. The fullerenes prefer to be attached with a hexagon parallel to the monolayer, where B and N favor proximity to the monolayer. The main electronic properties of the subsystems stay intact, suggesting weak interfacial interaction. Both the C-60/MoS2 and C-60/WS2 systems show type-II band alignments. However, the built-in potential in the former case is too small to effectively drive electron hole separation across the interface, whereas the latter system is predicted to show good photovoltaic performance. Unfortunately, B and N doping destroys the type-II band alignment on MoS2 and preserves it only in one spin channel on WS2, which is unsuitable for excitonic solar cells. Our results suggest that the C-60/WS2 system is highly promising for excitonic solar cells.
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