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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Alkoxybenzothiadiazole-Based Fullerene and Nonfullerene Polymer Solar Cells with High Shunt Resistance for Indoor Photovoltaic Applications

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Title
Alkoxybenzothiadiazole-Based Fullerene and Nonfullerene Polymer Solar Cells with High Shunt Resistance for Indoor Photovoltaic Applications
Author
Park, Song YiLi, YuxiangKim, JaewonLee, Tack HoWalker, BrightWoo, Han YoungKim, Jin Young
Keywords
dim light illumination;  indoor applications;  organic photovoltaics;  photovoltaic polymers;  polymer solar cells;  shunt resistance
Issue Date
201801
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.10, no.4, pp.3885 - 3894
Abstract
We synthesized three semicrystalline polymers (PTTBTBO, PDTBTBO, and P2FDTBT(BO)) by modulating the intra- and intermolecular noncovalent Coulombic interactions and investigated their photovoltaic characteristics under various light intensities. Low series (R-s) and high shunt (R-sh) resistances are essential prerequisites for good device properties under standard illumination (100 mW cm(-2)). Considering these factors, among three polymers, PDTBTBO 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 PC71BM under standard and dim light (2.5 mW cm(2)), respectively. P2FDTBT(BO) PSCs exhibited a low PCE of 3.69% under standard light due to significant charge recombination with high R-s (9.42 Omega cm(2)). 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-sh of over 1000 k Omega cm(2). R-s is less significant under dim light because the generated current is too small to cause noticeable R-s-induced voltage losses. Instead, high R-sh 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.
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DOI
http://dx.doi.org/10.1021/acsami.7b18152
ISSN
1944-8244
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