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Park, Hyesung
Sustainable Energy, Low-Dimensional Materials & Functional Devices Lab
Research Interests
  • Nano materials, renewable energy, optoelectronic devices

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Improved charge transport via WSe2-mediated hole transporting layer toward efficient organic solar cells

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Title
Improved charge transport via WSe2-mediated hole transporting layer toward efficient organic solar cells
Author
Koo, DonghwanJung, SeungonOh, Nam KhenChoi, YunseongSeo, JihyungLee, JunghyunKim, UngsooPark, Hyesung
Keywords
hole transport layer;  organic solar cells;  PEDOT:PSS;  transition metal dichalcogenides;  tungsten diselenide
Issue Date
201812
Publisher
IOP PUBLISHING LTD
Citation
SEMICONDUCTOR SCIENCE AND TECHNOLOGY, v.33, no.12, pp.236030 -
Abstract
Transition metal dichalcogenides (TMDs) have received significant attention because of their potential for replacing or modifying the existing charge transporting materials in organic solar cells (OSCs) with their unique crystalline structure and desirable electrical properties. Poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has been considered as the representative hole transporting material owing to its notable optical transmittance, electrical conductivity, and solution-processability. In this study, we provide a facile method to introduce a liquid-phase exfoliated TMD, tungsten diselenide (WSe2), as the device performance enhancer in OSCs. Implementation of WSe2 into PEDOT:PSS without significant change to the surface morphology mediates effective charge transport in the completed device. The phase separation of PEDOT and PSS induced by the WSe2 provides a conductivity enhancement in the modified hole transport layer (HTL), which contributes to the increase of hole mobility and decrease of charge recombination loss in the OSCs, resulting in the improvement of power conversion efficiency from 7.3% to 8.5% for pristine and modified HTL devices, respectively. These results provide a simple strategy for the enhancement of device performance in OSCs, demonstrating their promising potential in the application of TMDs for next-generation energy harvesting devices.
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DOI
http://dx.doi.org/10.1088/1361-6641/aaeab1
ISSN
0268-1242
Appears in Collections:
ECHE_Journal Papers

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