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Kim, Jin Young
Next Generation Energy Lab.
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Alkoxybenzothiadiazole-Based Fullerene and Nonfullerene Polymer Solar Cells with High Shunt Resistance for Indoor Photovoltaic Applications

Author(s)
Park, Song YiLi, YuxiangKim, JaewonLee, Tack HoWalker, BrightWoo, Han YoungKim, Jin Young
Issued Date
2018-01
DOI
10.1021/acsami.7b18152
URI
https://scholarworks.unist.ac.kr/handle/201301/23811
Fulltext
https://pubs.acs.org/doi/10.1021/acsami.7b18152
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.
Publisher
AMER CHEMICAL SOC
ISSN
1944-8244
Keyword (Author)
polymer solar cellsindoor applicationsdim light illuminationphotovoltaic polymersshunt resistanceorganic photovoltaics
Keyword
EFFICIENCYACCEPTORSVOLTAGE

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