title: Achieving high efficiency silicon-carbon nanotube heterojunction solar cells by acid doping.
abstract: Various approaches to improve the efficiency of solar cells have followed the integration of nanomaterials into Si-based photovoltaic devices. Here, we achieve 13.8% efficiency solar cells by combining carbon nanotubes and Si and doping with dilute HNO(3). Acid infiltration of nanotube networks significantly boost the cell efficiency by reducing the internal resistance that improves fill factor and by forming photoelectrochemical units that enhance charge separation and transport. Compared to conventional Si cells, the fabrication process is greatly simplified, simply involving the transfer of a porous semiconductor-rich nanotube film onto an n-type crystalline Si wafer followed by acid infiltration.
authors: Key Laboratory for Advanced Materials Processing Technology and Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
authors: Yi
authors: Y
authors: Jia
authors: Anyuan
authors: A
authors: Cao
authors: Xi
authors: X
authors: Bai
authors: Zhen
authors: Z
authors: Li
authors: Luhui
authors: L
authors: Zhang
authors: Ning
authors: N
authors: Guo
authors: Jinquan
authors: J
authors: Wei
authors: Kunlin
authors: K
authors: Wang
authors: Hongwei
authors: H
authors: Zhu
authors: Dehai
authors: D
authors: Wu
authors: P M
authors: PM
authors: Ajayan