Artigo Produção Nacional Revisado por pares

Bilayer and bulk heterojunction solar cells with functional poly(2,2′-bithiophene) films electrochemically deposited from aqueous emulsion

2013; Elsevier BV; Volume: 170; Linguagem: Inglês

10.1016/j.synthmet.2013.02.019

ISSN

1879-3290

Autores

Andréia G. Macedo, Daniel C. Silva, Natasha A. D. Yamamoto, Liliana Micaroni, Regina M. Q. Mello, Lucimara S. Roman,

Tópico(s)

Nanowire Synthesis and Applications

Resumo

Abstract Ultra thin films of poly(2,2′-bithiophene) with thickness of 11–33 nm were electrochemically deposited on poly(3,4-ethylenedioxithiophene):poly(styrene sulfonic acid) modified indium tin oxide substrates using a new approach for electrochemical synthesis. Ultrasonic emulsification of aqueous perchloric acid and 2,2′-bithiophene monomer is an effective method to disperse this water insoluble monomer in micro droplets that improved the contact with the electrode. Rigorous control of the poly(2,2′-bithiophene) thickness was achieved by controlling the potential applied and the charge during the deposition. We studied thin films solar cells based on poly(2,2′-bithiophene) polymer as bilayer with C 60 , resulting a power conversion efficiency of 0.3%, and as buffer layer in bulk heterojunction solar cells. We show that poly(2,2′-bithiophene) films influenced positively the open circuit voltage and increased about 1.6 times the short circuit current, increasing the efficiency from 1.3% up to 2.9% from devices without buffer layer or with 11 nm of poly(2,2′-bithiophene), respectively.

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