Tandem solar cells provide an effective way to harvest a broader spectrum of solar radiation by combining two or more
solar cells with different absorption ranges. However, for polymer solar cells (PSCs), the performance of tandem devices
lags behind single-layer cells mainly due to the lack of a high-performance low-bandgap polymer with appropriate
spectral response range. Here, we demonstrate a novel low bandgap conjugated polymer (~1.44 eV) specifically suitable for tandem structure. In the single-layer device, power conversion efficiency (PCE) of 6.5% was achieved. When the polymer was applied to tandem solar cells, we demonstrated a NREL certified PCE of 8.62% . Further optimization on materials and devices of this system has lead to record breaking efficiency of 10.6%. Furthermore, the tandem devices show excellent stability due both to the intrinsic stability of the polymer and the advanced device structure.
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Letian Dou ; Jingbi You ; Chun-Chao Chen ; Gang Li and Yang Yang
Plastic solar cells: breaking the 10% commercialization barrier
", Proc. SPIE 8477, Organic Photovoltaics XIII, 847702 (September 25, 2012); doi:10.1117/12.930410; http://dx.doi.org/10.1117/12.930410