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Proceedings Paper

Tandem stacking structure for polymer solar cells by using semi-transparent electrodes
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Paper Abstract

To increase the absorption of sunlight in polymer solar cells a large active layer thickness is desired. This, however, is limited by the short charge carrier diffusion lengths in the active organic materials. Efficient light harvesting can be achieved in organic solar cells by using a tandem structure. However, fabricating a tandem structure for polymer solar cells presents its own difficulties. Since the polymer film is solution processed, spin-coating multiple layers in tandem can result in significant damage to the underlying layers. This problem can be overcome by fabricating separate PV cells and stacking them in tandem. Here, we report a multiple-device stacked structure where two polymer photovoltaic cells are stacked together with the help of a multi-layer semi-transparent electrode, made of lithium fluoride (LiF) / aluminum (Al) / gold (Au) metal layers. The semi-transparent electrode is used as the top contact in the bottom cell to efficiently transmit the unabsorbed photons to the upper cell. Maximum transparency of up to 80% is achieved for the semitransparent cathode. In the stacked structure, the open circuit voltage and the short circuit current are twice those of a single cell. As a result, power conversion efficiency of up to 2.6% is achieved, which is double than that of a single cell.

Paper Details

Date Published: 3 November 2006
PDF: 7 pages
Proc. SPIE 6334, Organic Photovoltaics VII, 633416 (3 November 2006); doi: 10.1117/12.683159
Show Author Affiliations
Vishal Shrotriya, Univ. of California, Los Angeles (United States)
Gang Li, Univ. of California, Los Angeles (United States)
Yan Yao, Univ. of California, Los Angeles (United States)
Yang Yang, Univ. of California, Los Angeles (United States)

Published in SPIE Proceedings Vol. 6334:
Organic Photovoltaics VII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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