Solution processable thin film organic photovoltaic cells based on far red sensitive soluble squaraine dyes
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説明
Abstract Symmetrical squaraine (SQ) dyes with varying alkyl chain lengths have been synthesized towards their utilization as sensitizer for enhancing the photon harvesting in far-red region of solar spectrum. It has been observed that energy level of the SQ-dyes can be systematically tuned only by alkyl chain substitution. It has also been shown that SQ-dyes behave like p-type donors forming a p–n heterojunction with soluble fullerene derivative phenyl-C61-butyric acid methyl ester (PCBM) as n-type organic electron acceptor. Thin film organic photovoltaic p–n heterojunction devices have been fabricated using soluble SQ-dyes with PCBM without using any thermal evaporation technique for the active layers. A perusal of the photo-action spectra clearly corroborates that at least 0.25 eV energy barrier is necessary for the facile electron transfer from donor moiety to the acceptor after the photo-excitation.
収録刊行物
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- Thin Solid Films
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Thin Solid Films 522 401-406, 2011-09-28
Elsevier BV