Efficiency improvement in InP thin film solar cell using dielectric nanobars

• Published in: Physica scripta Vol. 98; no. 9; pp. 95520 - 95526
• Main Author: Khosravi, Saba
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01-09-2023
• Subjects: nanobars; photocurrent density; power conversion efficiency; Si nanopyramid array; TiO
• ISSN: 0031-8949; 1402-4896
• DOI: 10.1088/1402-4896/acef73

In this paper, to significantly improve the conversion efficiency in a 1
μ
m
InP
thin film solar cell, array of perpendicular
TiO
2
nanobars and backside grating are employed.
TiO
2
nanobars are coated with a desired anti-reflector (
AR
) and partially embedded in the
InP
film to achieve strong light trapping. Optimizing the size of
TiO
2
nanobars leads to an enhancement of 41.5% in the photocurrent current density,
J
ph
, and 49.3% in power conversion efficiency,
PCE
, related to the conventional
InP
film. For boosting the long wavelength absorption, a back reflector (
BR
) structure including six
SiO
2
layers with
Si
nanopyramid arrays is applied at the backside of the absorption film. Compared to the 1
μ
m
InP
thin film solar cell, the
J
ph 
and
PCE
are improved by 52.7% and about 59%, respectively. Finite-Difference-Time-Domain (FDTD) and Finite-Element-Method (FEM) are used to obtain the results.