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Issue 34, 2008
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Improving the efficiency of solution processable organic photovoltaic devices by a star-shaped molecular geometry

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Abstract

A new solution processable star-shaped organic molecule S(TPA-BT) has been synthesized for application in organic solar cells (OSCs). The properties and structures of S(TPA-BT) and a related linear molecule L(TPA-BT) were studied, including UV-visible spectroscopy, hole charge mobility, and theoretical calculated geometry and electronic properties. S(TPA-BT) film shows a broader and stronger absorption band in the range of 440–670 nm, lower band gap of 1.86 eV, higher hole mobility of 4.71 × 10−5 cm2V−1 s−1 and better film-forming properties compared with those of L(TPA-BT) film. ITO/PEDOT:PSS/S(TPA-BT) or L(TPA-BT):PCBM/Ba/Al bulk-heterojunction OSCs were fabricated with S(TPA-BT) or L(TPA-BT) as donor material. The power conversion efficiency (PCE) of an OSC based on a blend of S(TPA-BT) and PCBM (1 : 3, w/w) reached 1.33% under A.M. 1.5 illumination, 100 mW cm−2, with a short-circuit current density (JSC) of 4.18 mA cm−2, an open circuit voltage of 0.81 V, and a fill factor of 39%. The PCE of 1.33% and Jsc of 4.18 mA cm−2 are among the highest values reported so far for solution processable OSCs.

Graphical abstract: Improving the efficiency of solution processable organic photovoltaic devices by a star-shaped molecular geometry

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Article information


Submitted
01 May 2008
Accepted
25 Jun 2008
First published
21 Jul 2008

J. Mater. Chem., 2008,18, 4085-4090
Article type
Paper

Improving the efficiency of solution processable organic photovoltaic devices by a star-shaped molecular geometry

C. He, Q. He, Y. Yi, G. Wu, F. Bai, Z. Shuai and Y. Li, J. Mater. Chem., 2008, 18, 4085
DOI: 10.1039/B807456A

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