TY - JOUR
T1 - Ultra-fast plasmonic back reflectors production for light trapping in thin Si solar cells
AU - Araújo, Andreia
AU - Mendes, Manuel J.
AU - Mateus, Tiago
AU - Costa, João
AU - Nunes, Daniela
AU - Fortunato, Elvira
AU - Águas, Hugo
AU - Martins, Rodrigo
N1 - info:eu-repo/grantAgreement/FCT/5876/147333/PT#
info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F85587%2F2012/PT#
info:eu-repo/grantAgreement/EC/H2020/685758/EU#
ALTALUZ (Reference PTDC/CTM-ENE/5125/2014).
grant SFRH/BPD/115566/2016.
PY - 2018/11/1
Y1 - 2018/11/1
N2 - A fast method is presented to fabricate plasmonic light trapping structures in just ten minutes (>5 × faster than the present state of art), with excellent light scattering properties. The structures are composed of silver nanoparticles (Ag NPs) deposited by thermal evaporation and self-assembled using a rapid thermal annealing (RTA) system. The effect of the RTA heating rate on the NPs production reveals to be crucial to the decrease of the annealing process. The Ag NPs are integrated in thin film silicon solar cells to form a plasmonic back reflector (PBR) that causes a diffused light reflectivity in the near-infrared (600–1100 nm wavelength region). In this configuration the thicknesses of the AZO spacer/passivating layers between NPs and rear mirror, and between NPs and silicon layer, play critical roles in the near-field coupling of the reflected light towards the solar cell absorber, which is investigated in this work. The best spacer thicknesses were found to be 100 and 60 nm, respectively, for Ag NPs with preferential sizes of about 200 nm. The microcrystalline silicon (μc-Si:H) solar cells deposited on such improved PBR demonstrate an overall 11% improvement on device efficiency, corresponding to a photocurrent of 24.4 mA/cm2 and an efficiency of 6.78%, against 21.79 mA/cm2 and 6.12%, respectively, obtained on flat structures without NPs.
AB - A fast method is presented to fabricate plasmonic light trapping structures in just ten minutes (>5 × faster than the present state of art), with excellent light scattering properties. The structures are composed of silver nanoparticles (Ag NPs) deposited by thermal evaporation and self-assembled using a rapid thermal annealing (RTA) system. The effect of the RTA heating rate on the NPs production reveals to be crucial to the decrease of the annealing process. The Ag NPs are integrated in thin film silicon solar cells to form a plasmonic back reflector (PBR) that causes a diffused light reflectivity in the near-infrared (600–1100 nm wavelength region). In this configuration the thicknesses of the AZO spacer/passivating layers between NPs and rear mirror, and between NPs and silicon layer, play critical roles in the near-field coupling of the reflected light towards the solar cell absorber, which is investigated in this work. The best spacer thicknesses were found to be 100 and 60 nm, respectively, for Ag NPs with preferential sizes of about 200 nm. The microcrystalline silicon (μc-Si:H) solar cells deposited on such improved PBR demonstrate an overall 11% improvement on device efficiency, corresponding to a photocurrent of 24.4 mA/cm2 and an efficiency of 6.78%, against 21.79 mA/cm2 and 6.12%, respectively, obtained on flat structures without NPs.
KW - Plasmonic light trapping
KW - Rapid thermal annealing
KW - Silver nanoparticle self-assembled structures
KW - Thin film Si solar cells
UR - http://www.scopus.com/inward/record.url?scp=85054004795&partnerID=8YFLogxK
U2 - 10.1016/j.solener.2018.08.068
DO - 10.1016/j.solener.2018.08.068
M3 - Article
AN - SCOPUS:85054004795
SN - 0038-092X
VL - 174
SP - 786
EP - 792
JO - Solar Energy
JF - Solar Energy
ER -