Highly efficient dye‐sensitized solar cells using phenothiazine derivative organic dyes

Progress in Photovoltaics: Research and Applications - Tập 18 Số 8 - Trang 573-581 - 2010
Zhibin Xie1,2,3,4, Anupam Midya5,3, Kian Ping Loh5,2,4, Stefan Adams1, Daniel John Blackwood1, John Wang1, Xuanjun Zhang5,6, Zhi‐Kuan Chen6
1Department of Materials Science and Engineering, National University of Singapore, Singapore 117574, Singapore
2Kian Ping Loh, Department of Chemistry, National University of Singapore, Singapore 117543, Singapore.===
3Z.B. Xie and A. Midya contributed equally to this work.
4ZhiBin Xie, Department of Materials Science and Engineering, National University of Singapore, Singapore 117574, Singapore.===
5Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
6Institute of Materials Research & Engineering, 3 Research Link, Singapore 117602, Singapore

Tóm tắt

AbstractTwo novel organic dyes have been synthesized using electron rich phenothiazine as electron donors and oligothiophene vinylene as conjugation spacers. The two dyes (2E)‐2‐cyano‐3‐(5‐(5‐((E)‐2‐(10‐(2‐ethylhexyl)‐10H‐phenothiazin‐7‐yl)vinyl)thiophen‐2‐yl)thiophen‐2‐yl)acrylic acid (PTZ‐1) and (2E)‐3‐(5‐(5‐(4,5‐bis((E)‐2‐(10‐(2‐ethylhexyl)‐10H‐phenothiazin‐3‐yl)vinyl)thiophen‐2‐yl)thiophen‐2‐yl)thiophen‐2‐yl)‐2‐cyanoacrylic acid (PTZ‐2) were fully characterized and employed in dye‐sensitized solar cells (DSCs) to explore the effect of disubstituted donors on photovoltaic (PV) performance. The solar cells sensitized by the PTZ1 dye have a high IPCE plateau of 80% and achieve a short‐circuit photocurrent density of 12.98 mA/cm2, an open‐circuit voltage of 0.713 V, and a fill factor (ff) of 66.6%, corresponding to a conversion efficiency of 6.17% under AM 1.5 100 mW/cm2 illumination. The different performance of the solar cells based on the two dyes can be understood from the studies of the electron kinetics by electrochemical impedance spectroscopy (EIS). These investigations reveal that disubstituted donors in the organic sensitizers of three or more conjugation units deteriorate the PV performance due to enhanced recombination. Copyright © 2010 John Wiley & Sons, Ltd.

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Thông tin xuất bản

Progress in Photovoltaics: Research and Applications

Tập 18 Số 8

573-581

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