Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/77705
Título: | Graded morphologies and the performance of PffBT4T-2OD:PC71BM devices using additive choice |
Autor(es): | Gaspar, Hugo Parnell, Andrew J. Pérez, Gabriel E. Viana, J. C. King, Stephen M. Mendes, Adélio Pereira, Luiz Bernardo, Gabriel |
Palavras-chave: | Organic photovoltaics bulk-heterojunction morphology additives PffBT4T-2OD |
Data: | 12-Dez-2021 |
Editora: | Multidisciplinary Digital Publishing Institute (MDPI) |
Revista: | Nanomaterials |
Citação: | Gaspar, H.; Parnell, A.J.; Pérez, G.E.; Viana, J.C.; King, S.M.; Mendes, A.; Pereira, L.; Bernardo, G. Graded Morphologies and the Performance of PffBT4T-2OD:PC71BM Devices Using Additive Choice. Nanomaterials 2021, 11, 3367. https://doi.org/10.3390/nano11123367 |
Resumo(s): | The impact of several solvent processing additives (1-chloronaphthalene, methylnaphthalene, hexadecane, 1-phenyloctane, and p-anisaldehyde), 3% v/v in o-dichlorobenzene, on the performance and morphology of poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3"'-di(2-octyldodecyl)-2,2 ',5 ',22033,5 '',2"'-quaterthiophen-5,5"'-diyl)] (PffBT4T-2OD):[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM)-based polymer solar cells was investigated. Some additives were shown to enhance the power conversion efficiency (PCE) by ~6%, while others decreased the PCE by ~17-25% and a subset of the additives tested completely eliminated any power conversion efficiency and the operation as a photovoltaic device. Grazing-Incidence Wide Angle X-ray Scattering (GIWAXS) revealed a clear stepwise variation in the crystallinity of the systems when changing the additive between the two extreme situations of maximum PCE (1-chloronaphthalene) and null PCE (hexadecane). Small-Angle Neutron Scattering (SANS) revealed that the morphology of devices with PCE ~0% was composed of large domains with correlation lengths of ~30 nm, i.e., much larger than the typical exciton diffusion length (~12 nm) in organic semiconductors. The graded variations in crystallinity and in nano-domain size observed between the two extreme situations (1-chloronaphthalene and hexadecane) were responsible for the observed graded variations in device performance. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/77705 |
DOI: | 10.3390/nano11123367 |
ISSN: | 2079-4991 |
Versão da editora: | https://www.mdpi.com/2079-4991/11/12/3367 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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nanomaterials-11-03367-v2.pdf | 2,3 MB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons