High-performance nonfullerene polymer solar cells based on a fluorinated wide bandgap copolymer with a high open-circuit voltage of 1.04 V
2017
Wang, Yan | Fan, Qunping | Guo, Xia | Li, Wanbin | Guo, Bing | Su, Wenyan | Ou, Xuemei | Zhang, Maojie
In this work, efficient nonfullerene (NF) polymer solar cells (PSCs) based on a polymer donor PM6 containing a fluorinated-thienyl benzodithiophene unit and a small molecule acceptor ITIC were developed. PM6 possesses a strong absorption in the short wavelength region of 300–685 nm with a large bandgap of 1.80 eV, which is complementary to that of ITIC (1.55 eV) and facilitates achieving high short-circuit current (Jₛc) in PSCs. Moreover, PM6 shows a deep HOMO level of −5.50 eV, a strong crystallinity and a dominant face on packing, which helps to achieve a high open-circuit voltage (Vₒc) and fill factor (FF) in PSCs. As a result, the PM6:ITIC-based PSCs obtained a power conversion efficiency (PCE) of 9.7% with a Vₒc of up to 1.04 V, a Jₛc of 16.0 mA cm⁻² and a FF of 58%, under the illumination of AM 1.5G, 100 mW cm⁻². Notably, the energy loss (Eₗₒₛₛ) of the PSCs is as low as 0.51 eV, which is smaller than the empirically low threshold of 0.6 eV. The PCE of 9.7% is one of the highest values reported in the literature for PSCs with a Vₒc over 1.0 V and an Eₗₒₛₛ less than 0.55 eV.
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