title: Methyl/allyl monolayer on silicon: efficient surface passivation for silicon-conjugated polymer hybrid solar cell.
abstract: We demonstrate a hybrid Schottky junction solar cell based on methyl/allyl groups terminated silicon nanowire arrays (SiNWs) and poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) with a power conversion efficiency (PCE) of 10.2%. The methyl/allyl organic monolayer on silicon can act as an excellent passivation layer for suppressing surface charge recombination, which is characterized by grazing angle attenuated total reflectance Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy measurements. The transient and steady electric output characteristics measurements indicate that the density of trap states of SiNWs are dramatically suppressed by methyl/allyl surface modification. In addition, the device based on methyl/allyl passivated SiNWs exhibits improved stable electrical output over those based on either methyl or allyl passivated ones. The improved PCE and good stability of the device are ascribed to efficient functionalization of the SiNW surface.
authors: Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, China.
authors: Fute
authors: F
authors: Zhang
authors: Dong
authors: D
authors: Liu
authors: Yunfang
authors: Y
authors: Zhang
authors: Huaixin
authors: H
authors: Wei
authors: Tao
authors: T
authors: Song
authors: Baoquan
authors: B
authors: Sun