Tuning of spacer groups in organic dyes for efficient inhibition of charge recombination in dye-sensitized solar cells

Autor:	Nam-Gyu Park, Young-Sam Jung, Chang-Ryul Lee, Jong-Hyung Kim, Soo-Byung Ko, Mi-Jeong Kim, In-Hyuk Jang, Young-Uk Kwon, Kwang-Yol Kay, Yong-Jae Yu
Rok vydání:	2012
Předmět:	Process Chemistry and Technology General Chemical Engineering chemistry.chemical_element Photochemistry Triphenylamine Electron transport chain Ruthenium chemistry.chemical_compound Dye-sensitized solar cell chemistry Phenothiazine Density functional theory Hypsochromic shift HOMO/LUMO
Zdroj:	Dyes and Pigments. 95:134-141
ISSN:	0143-7208
DOI:	10.1016/j.dyepig.2012.04.002
Popis:	Most of the studied organic dyes for dye-sensitized solar cell have exhibited low photovoltage due to fast charge recombination. Here, we report on synthetic strategy of organic dye to get high photovoltage. Phenothiazine ( PTZ ) moieties are incorporated between electron donating triphenylamine ( D ) and electron accepting cyanoacrylic acid ( A ) to enhance non-planarity. Compared to one PTZ incorporation ( D-PTZ-A ), hypsochromic shift in absorption is observed by incorporation of two PTZs ( D-PTZ1–PTZ2-A ) due to transition from HOMO-1 to LUMO as confirmed by density functional theory (DFT) calculation. D-PTZ1–PTZ2-A shows higher photovoltage (0.804 V) than D-PTZ-A (0.781 V), those which are even higher than that of the ruthenium-based N719 -snesitized one (0.775 V). Little difference in electron transport rate is observed for PTZ derivatives and N719 , while electron life time is increased in the order of D-PTZ1–PTZ2-A > D-PTZ-A > N719 . Retardation of electron recombination is responsible for the high photovoltage, which is associated with bent conformation induced by PTZ spacer group.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::53bede132c8cd1dc5babddeadd95aebb https://doi.org/10.1016/j.dyepig.2012.04.002 Zobrazit plný text záznamu Full Text from ScienceDirect