کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1666676 | 1518082 | 2012 | 6 صفحه PDF | دانلود رایگان |
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.
► Squaraine dyes with systematically varying energy levels have been synthesized.
► They exhibit intense light absorption in far-red region with narrow absorption window.
► Completely solution processable organic solar cells were fabricated.
► Solar cells were made using squaraine dyes with a fullerene derivative.
► Need of about 0.25 eV energy barriers for facile electron transfer was demonstrated.
Journal: Thin Solid Films - Volume 522, 1 November 2012, Pages 401–406