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Effect of the Energy Level and the Carrier Mobility of the Hole Extraction Layer on the Performance of Planar-mixed Heterojunction Organic Solar Cells

Authors
Lee, HyunhoKim, Jun YoungKim, JaehoonSong, Hyung-Jun
Issue Date
Nov-2020
Publisher
한국물리학회
Keywords
Organic solar cells; Planar mixed heterojunction; Hole extraction layers; Energy barrier; Collection voltage
Citation
Journal of the Korean Physical Society, v.77, no.9, pp 806 - 810
Pages
5
Indexed
SCIE
SCOPUS
KCI
Journal Title
Journal of the Korean Physical Society
Volume
77
Number
9
Start Page
806
End Page
810
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/6048
DOI
10.3938/jkps.77.806
ISSN
0374-4884
1976-8524
Abstract
We systematically explored the effect of the electrical property of a homogenously deposited donor layer (H-Donor) on the efficiency of planar-mixed heterojunction organic solar cells. The equivalent circuit model analysis and the dark current characteristics indicate that an increased energy barrier for the electron between the mixed layer and the H-Donor (Delta E-LUMO) decreases the leakage path, thereby resulting in an improved fill factor of the cell. Moreover, the incorporation of H-Donor with high hole mobility (mu(h)) to device leads to enhanced charge collecting efficiency and decreased recombination losses. As a result, the device containing H-Donor with high mu(h) and Delta E-LUMO showed 28% improvement in power conversion efficiency (5.54%) compared to that of a device with the conventional structure. We believe that this strategy will be a guideline to unlock the full potential of materials in organic solar cells.
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