title: Comparison of Nanocarbon-Silicon Solar Cells with Nanotube-Si or Graphene-Si Contact.
abstract: Nanocarbon structures such as carbon nanotubes (CNTs) and graphene (G) have been combined with crystalline silicon wafers to fabricate nanocarbon-Si solar cells. Here, we show that the contact between the nanocarbon and Si plays an important role in the solar cell performance. An asymmetrically configured CNT-G composite film was used to create either CNT-Si dominating or G-Si dominating junctions, resulting in obviously different solar cell behavior in pristine state. Typically, solar cells with direct G-Si contacts (versus CNT-Si) exhibit better characteristics due to improved junction quality and larger contact area. On the basis of the composite film, the obtained CNT-G-Si solar cells reach power conversion efficiencies of 14.88% under air mass 1.5, 88 mW/cm2 illumination through established techniques such as acid doping and colloidal antireflection. Engineering the nanocarbon-Si contact is therefore a possible route for further improving the performance of this type of solar cells.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Xu
authors.forename: Bing
authors.initials: B
authors.lastname: Deng
authors.forename: Enzheng
authors.initials: E
authors.lastname: Shi
authors.forename: Shiting
authors.initials: S
authors.lastname: Wu
authors.forename: Mingchu
authors.initials: M
authors.lastname: Zou
authors.forename: Liusi
authors.initials: L
authors.lastname: Yang
authors.affiliation: §School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Materials Processing Technology of MOE, Tsinghua University, Beijing 100084, People's Republic of China.
authors.forename: Jinquan
authors.initials: J
authors.lastname: Wei
authors.forename: Hailin
authors.initials: H
authors.lastname: Peng
authors.forename: Anyuan
authors.initials: A
authors.lastname: Cao
keywords: carbon nanotube; contact; graphene; junction; nanocarbon−Si solar cell