Efficient light harvesting by photon downconversion and light trapping in hybrid ZnS nanoparticles/Si nanotips solar cells.
A hybrid colloidal ZnS nanoparticles/Si nanotips p-n active layer has been demonstrated to have promising potential for efficient solar spectrum utilization in crystalline silicon-based solar cells. The hybrid solar cell shows an enhancement of 20% in the short-circuit current and approximately 10% in power conversion efficiency compared to its counterpart without integrating ZnS nanoparticles. The enhancement has been investigated by external quantum efficiency, photoluminescence excitation spectrum, photoluminescence, and reflectance to distinct the role of ZnS quantum dots for light harvesting. It is concluded that ZnS nanoparticles not only act as frequency downconversion centers in the ultraviolet region but also serve as antireflection coating for light trapping in the measured spectral regime. Our approach is ready to be extended to many other material systems for the creation of highly efficient photovoltaic devices.
Huang
Chun-Ying
CY
Graduate Institute of Electronics Engineering, National Taiwan University, Taipei 106, Taiwan.
Wang
Di-Yan
DY
Wang
Chun-Hsiung
CH
Chen
Yung-Ting
YT
Wang
Yaw-Tyng
YT
Jiang
You-Ting
YT
Yang
Ying-Jay
YJ
Chen
Chia-Chun
CC
Chen
Yang-Fang
YF