title: Low-Pressure-Assisted Coating Method To Improve Interface between PEDOT:PSS and Silicon Nanotips for High-Efficiency Organic/Inorganic Hybrid Solar Cells via Solution Process.
abstract: Nanostructured silicon hybrid solar cells are promising candidates for a new generation photovoltaics because of their light-trapping abilities and solution processes. However, the performance of hybrid organic/Si nanostructure solar cells is hindered because of carrier recombination at surface and poor coverage of organic material poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (
  PSS) on nanostructures. Here we demonstrate low-pressure-assisted coating method of
  PSS on surface-modified silicon nanotips with broadband light-trapping characteristics to improve interface property and to achieve high-efficiency hybrid solar cells through a solution process. The approach enhances the effective minority-carrier lifetime and the coverage of
  PSS on the surface of nanostructures. Hybrid solar cells fabricated with surface-modified nanotips exhibit a high fill factor of 70.94%, short-circuit current density of 35.36 mA/cm(2), open-circuit voltage of 0.528 V, and power conversion efficiency of 13.36%. The high efficiency and the high fill factor are achieved because of conformal coating of
  PSS via a low-pressure-assisted coating process, excellent light harvesting without sacrificing the minority-carrier lifetime, and efficient charge separation/collection of photogenerated carriers.
authors.affiliation: Graduate Institute of Photonics and Optoelectronics, ‡Graduate Institute of Electronics Engineering, §Department of Electrical Engineering, and ∥Innovative Photonics Advanced Research Center, National Taiwan University , Taipei 10617, Taiwan.
authors.forename: Thiyagu
authors.initials: T
authors.lastname: Subramani
authors.affiliation: Graduate Institute of Photonics and Optoelectronics, ‡Graduate Institute of Electronics Engineering, §Department of Electrical Engineering, and ∥Innovative Photonics Advanced Research Center, National Taiwan University , Taipei 10617, Taiwan.
authors.forename: Hong-Jhang
authors.initials: HJ
authors.lastname: Syu
authors.affiliation: Graduate Institute of Photonics and Optoelectronics, ‡Graduate Institute of Electronics Engineering, §Department of Electrical Engineering, and ∥Innovative Photonics Advanced Research Center, National Taiwan University , Taipei 10617, Taiwan.
authors.forename: Chien-Ting
authors.initials: CT
authors.lastname: Liu
authors.affiliation: Graduate Institute of Photonics and Optoelectronics, ‡Graduate Institute of Electronics Engineering, §Department of Electrical Engineering, and ∥Innovative Photonics Advanced Research Center, National Taiwan University , Taipei 10617, Taiwan.
authors.forename: Chen-Chih
authors.initials: CC
authors.lastname: Hsueh
authors.affiliation: Graduate Institute of Photonics and Optoelectronics, ‡Graduate Institute of Electronics Engineering, §Department of Electrical Engineering, and ∥Innovative Photonics Advanced Research Center, National Taiwan University , Taipei 10617, Taiwan.
authors.forename: Song-Ting
authors.initials: ST
authors.lastname: Yang
authors.affiliation: Graduate Institute of Photonics and Optoelectronics, ‡Graduate Institute of Electronics Engineering, §Department of Electrical Engineering, and ∥Innovative Photonics Advanced Research Center, National Taiwan University , Taipei 10617, Taiwan.
authors.forename: Ching-Fuh
authors.initials: CF
authors.lastname: Lin
keywords: PEDOT:PSS; chemical polishing etching; hybrid solar cells; low-pressure-assisted coating; silicon nanotips