A carregar...
Projeto de investigação
Flexible tandem solar cells based on amorphous and nanocrystalline silicon
Financiador
Autores
Publicações
Preparation and characterization of a-SiC:H absorber layer for semi-transparent solar cells
Publication . Vygranenko, Yuri; Fernandes, Miguel; Louro, Paula; Vieira, Manuela; Sazonov, Andrei
This paper reports on device-quality silicon-carbon alloy (a-SiC:H) application as an absorber material in semi-transparent solar cells. Films with an optical bandgap ranging from 2 to 2.3 eV were prepared by plasma enhanced chemical vapour deposition (PECVD). The n-i-p structures with undoped SiC:H layers deposited under the same experimental conditions were also fabricated and characterized. The optimized devices showed forward current-voltage characteristics with a diode ideality factor in the range from 1.4 to 1.8, and an open circuit voltage up to 0.92 V. The density of deep defect states in a SiC:H was estimated from the transient current measurements and correlated with the optical bandgap.
Characterization of a-Si:H solar cell modules on plastic substrates by high resolution LBIC technique
Publication . Fernandes, Miguel; Vygranenko, Yuri; Vieira, Manuela; Sazonov, Andrei; Yang, R.; Khosropour, A.
This article reports on characterization of hydrogenated amorphous silicon (a-Si:H) photovoltaic modules fabricated on 100 mu m thick PEN plastic films. Experimental results show that the shunt leakage is one of the factors reducing the device performance. Current-voltage characteristics of individual a-Si:H p-i-n cells were analysed to estimate a variation of shunt resistances. A SPICE model of the a-Si:H p-i-n cell with local shunt leakage was also developed to analyse the impact of leakage currents on the device performance. Using the LBIC technique, the presence of multiple shunts in the cell was detected. They are attributed to surface defects in plastic foils, which are thermally induced during the device fabrication. (C) 2015 Published by Elsevier Ltd.
Unidades organizacionais
Descrição
Palavras-chave
Contribuidores
Financiadores
Entidade financiadora
Fundação para a Ciência e a Tecnologia
Programa de financiamento
OE
Número da atribuição
SFRH/BPD/102217/2014