Alkoxybenzothiadiazole-Based Fullerene and Nonfullerene Polymer Solar Cells with High Shunt Resistance for Indoor Photovoltaic Applications.
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ACS applied materials & interfaces, ISSN: 1944-8252, Vol: 10, Issue: 4, Page: 3885-3894
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- Materials Science; dim light illumination; indoor applications; organic photovoltaics; photovoltaic polymers; polymer solar cells; shunt resistance
We synthesized three semicrystalline polymers (PTTBT, PDTBT, and P2FDTBT) by modulating the intra- and intermolecular noncovalent Coulombic interactions and investigated their photovoltaic characteristics under various light intensities. Low series (R) and high shunt (R) resistances are essential prerequisites for good device properties under standard illumination (100 mW cm). Considering these factors, among three polymers, PDTBT polymer solar cells (PSCs) exhibited the most desirable characteristics, with peak power conversion efficiencies (PCE) of 7.52 and 9.60% by being blended with PCBM under standard and dim light (2.5 mW cm), respectively. P2FDTBT PSCs exhibited a low PCE of 3.69% under standard light due to significant charge recombination with high R (9.42 Ω cm). However, the PCE was remarkably improved by 2.3 times (8.33% PCE) under dim light, showing negligible decrease in open-circuit voltage and remarkable increase in fill factor, which is due to an exceptionally high R of over 1000 kΩ cm. R is less significant under dim light because the generated current is too small to cause noticeable R-induced voltage losses. Instead, high R becomes more important to avoid leakage currents. This work provides important tips to further optimize PSCs for indoor applications with low-power electronic devices such as Internet of things sensors.