We
propose a water vapor treatment to direct the formation of single-walled
carbon nanotubes (SWNTs) into a self-assembled microhoneycomb network
(μ-HN) for the application to SWNT-Si solar cells. The μ-HN
consists of vertical aggregated SWNT walls and a buckypaper bottom.
This hierarchical structure exhibits lower sheet resistance and higher
optical transmittance compared with buckypaper. The pristine μ-HN
SWNT-Si solar cell shows a record-high fill factor of 72% as well
as a power conversion efficiency (PCE) of 6% without optimizing the
diameter or height of the vertically aligned SWNTs. The PCE remains
stable for weeks under ambient condition, and a PCE exceeding 10%
is achieved in the dry state after dilute nitric acid treatment.
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