Self-Assembled Microhoneycomb Network of Single-Walled Carbon Nanotubes for Solar Cells
journal contributionposted on 16.12.2015 by Kehang Cui, Takaaki Chiba, Shuichiro Omiya, Theerapol Thurakitseree, Pei Zhao, Shunjiro Fujii, Hiromichi Kataura, Erik Einarsson, Shohei Chiashi, Shigeo Maruyama
Any type of content formally published in an academic journal, usually following a peer-review process.
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.