title: Role of a disperse carbon interlayer on the performances of tandem a-Si solar cells.
abstract: We report the effect of a disperse carbon interlayer between the n-a-Si:H layer and an aluminium zinc oxide (AZO) back contact on the performance of amorphous silicon solar cells. Carbon was incorporated to the AZO film as revealed by x-ray photoelectron spectroscopy and energy-dispersive x-ray analysis. Solar cells fabricated on glass substrates using AZO in the back contact performed better when a disperse carbon interlayer was present in their structure. They exhibited an initial efficiency of 11%, open-circuit voltageVoc= 1.6 V, short-circuit currentJSC= 11 mA cm-2and a filling factor of 63%, that is, a 10% increase in theJSCand 20% increase in the efficiency compared to a standard solar cell.
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.
authors.forename: Andreia
authors.initials: A
authors.lastname: Araújo
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.
authors.forename: Raquel
authors.initials: R
authors.lastname: Barros
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.
authors.forename: Tiago
authors.initials: T
authors.lastname: Mateus
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.
authors.forename: Diana
authors.initials: D
authors.lastname: Gaspar
authors.affiliation: INNOVNANO, Materiais Avançados, SA, 3040-570 Antanhol, Portugal.
authors.forename: Nuno
authors.initials: N
authors.lastname: Neves
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.
authors.forename: António
authors.initials: A
authors.lastname: Vicente
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.
authors.forename: Sergej A
authors.initials: SA
authors.lastname: Filonovich
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.
authors.forename: Pedro
authors.initials: P
authors.lastname: Barquinha
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.
authors.forename: Elvira
authors.initials: E
authors.lastname: Fortunato
authors.affiliation: CQFM and IN, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal.
authors.forename: Ana M
authors.initials: AM
authors.lastname: Ferraria
authors.affiliation: CQFM and IN, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal.
authors.forename: Ana M
authors.initials: AM
authors.lastname: Botelho do Rego
authors.affiliation: Solar Plus, Produção de Painéis Solares SA, 3770-305 Oliveira do Bairro, Portugal.
authors.forename: Ana
authors.initials: A
authors.lastname: Bicho
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.
authors.forename: Hugo
authors.initials: H
authors.lastname: Águas
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Martins
keywords: 10.11; 20.11; 30.07; nanostructured powders; oxide interfaces and composition; silicon solar cells; transparent conducting oxides