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Improving the stability of bulk heterojunction solar cells by incorporating pH-neutral PEDOT:PSS as the hole transport layer.
ACS Appl Mater Interfaces ; 6(7): 5122-9, 2014 Apr 09.
Artigo em Inglês | MEDLINE | ID: mdl-24611433
ABSTRACT
In the application of traditional bulk heterojunction polymer solar cells, to prevent the etching of ITO by the acidic poly(3,4-ethylenedioxythiophene)poly(styrenesulfonate) (PEDOTPSS) and thereby improve the device stability, pH-neutral PEDOTPSS is introduced as the hole transport layer (HTL). After treating the neutral PEDOTPSS with UV-ozone and with an oxygen plasma, the average power conversion efficiency (PCE) of the device increases from 3.44% to 6.60%. Such surface treatments reduce the energy level offset between the HTL and the active layer, which increases the open circuit voltage and enhances hole transportation, leading to the PCE improvement. Moreover, the devices with the neutral PEDOTPSS HTL are more stable in air than those with the acidic PEDOTPSS HTL. The PCE of the devices with the acidic PEDOTPSS HTL decreases by 20% after 7 days and 45% after 50 days under ambient conditions, whereas the PCE of the devices with the pH-neutral PEDOTPSS HTL decreases by only 9 and 20% after 7 and 50 days, respectively. X-ray photoelectron spectroscopy shows that the acidic PEDOTPSS etches the indium from the indium-tin-oxide (ITO) electrode, which is responsible for the degradation of the device. In comparison, the diffusion of the indium is much slower in the devices with the pH-neutral PEDOTPSS HTL.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: ACS Appl Mater Interfaces Assunto da revista: Biotecnologia / Engenharia Biomédica Ano de publicação: 2014 Tipo de documento: Artigo