Photonic crystal intermediate reflectors for micromorph solar cells: a comparative study.
Wave-optics analysis is performed to investigate the benefits of utilizing Bragg-reflectors and inverted ZnO opals as intermediate reflectors in micromorph cells. The Bragg-reflector and the inverted ZnO opal intermediate reflector increase the current generated in a 100 nm thick upper a-Si:H cell within a micromorph cell by as much as 20% and 13%, respectively. The current generated in the bottom muc-Si:H cell within the micromorph is also greater when the Bragg-reflector is used as the intermediate reflector. The Bragg-reflector outperforms the ZnO inverted opal because it has a larger stop-gap, is optically thin, and due to greater absorption losses that occur in the opaline intermediate reflectors.
O'Brien
P G
PG
Department of Materials Science and Engineering, University of Toronto, 184 College Street, room 140 Toronto, Ontario M5S 3E4, Canada.
Chutinan
A
A
Leong
K
K
Kherani
N P
NP
Ozin
G A
GA
Zukotynski
S
S