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SOLAR ENERGY R&D IN ASIA

Effective Light Harvesting of Tandem Polymer Solar Cell

[+] Author and Article Information
Yi-Chun Chen, Chao-Ying Yu, Chih-Ping Chen, Shu-Hua Chan, Ching Ting

Materials and Chemical Laboratories, Industrial Technology Research Institute, 195, Sec. 4, Chung Hsing Road, Hsinchu 310, Taiwan, Republic of China

J. Sol. Energy Eng 132(2), 021103 (May 03, 2010) (6 pages) doi:10.1115/1.4001150 History: Received December 30, 2008; Revised September 23, 2009; Published May 03, 2010; Online May 03, 2010

A novel soluble conjugated polymers, P2, with coplanar thiophene-phenylene-thiophene unit is designed and synthesized as suitable active material used in tandem cells to compensate the poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl-C71 butyric acid methyl ester (PC71BM) bulk-heterojunction cell in this paper. P2 polymer bears advantages in both low optical bandgap (1.7 eV) and high hole mobility properties (3.4×103cm2/V-s from field-effect transistor measurement). Furthermore, the electrochemical studies of P2 indicate desirable highest occupied molecular orbital/lowest unoccupied molecular orbital (HOMO/LUMO) band structure that enables a high open circuit voltage when pairing with PCBM acceptor. The best power conversion efficiency of this polymer solar cell thus far based on P2/PC71BM system with a weight ratio of 1:3 reached 4.4% with a short circuit current density (Jsc) of 10.2mA/cm2, an open circuit voltage (Voc) of 0.81 V, and a fill factor (FF) of 0.53 under air mass (AM) 1.5 G (100mW/cm2). The preliminary data of the tandem cell with indium tin oxide (ITO) glass/PEDOT:PSS/P2:PC71BM/TiOx/PEDOT:PSS/P3HT:PC71BM/TiOx/Al configuration has reached Jsc of 6.2mA/cm2, Voc of 1.33 V, FF of 0.56 and an overall efficiency of 4.6% under AM 1.5 G (100mW/cm2).

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

The schematic structure of P2 as well as the UV-vis spectra of P2 film (━), P3HT film (…), and P2:PCBM(1:3) (–•–) film; photoluminescence in P2 film (—) and photoluminescence quenching for P2:PCBM(1:3) (---)

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Figure 2

The device architecture (left) and SEM cross-sectional image (right) of the PSC. Scale bars, 100 nm.

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Figure 3

(a) Current density-potential characteristic of P2 solar cell devices under illumination with AM 1.5 G solar simulated light (100 mW/cm2) and (b) EQE spectra of devices fabricated with P3HT/PC61BM and P2/PC71BM system

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Figure 4

(a) The configuration and (b) the energy band diagram of tandem cell. (c) The I-V characteristic of tandem cell consists of P2/PC71BM (front cell) and P3HT/PC71BM (back cell) subcells

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Figure 5

Illustration of the configurations of a tandem cell and two subcells in absorption studies. Quarts for subcell 1 and ITO glass for subcell 2 are added pieces for protection and support.

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Figure 6

Transmittance spectra of backcell with (d, ---) and without (a, …) front cell along with that of the front cell (b, ━) and tandem cell (c, —).

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