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Investigating the Indoor Performance of Planar Heterojunction Based Organic Photovoltaics

Authors
Kim, Sang HyeonSaeed, Muhammad AhsanLee, Sae YounShim, Jae Won
Issue Date
7월-2021
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
Absorption; Annealing; Electrodes; Heterojunctions; Indoor organic photovoltaics (OPVs); Lighting; Performance evaluation; Photovoltaic systems; interdiffusion; parasitic resistance; planar heterojunction (PHJ)
Citation
IEEE JOURNAL OF PHOTOVOLTAICS, v.11, no.4, pp.997 - 1003
Indexed
SCIE
SCOPUS
Journal Title
IEEE JOURNAL OF PHOTOVOLTAICS
Volume
11
Number
4
Start Page
997
End Page
1003
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/137269
DOI
10.1109/JPHOTOV.2021.3074077
ISSN
2156-3381
Abstract
Recently, the bulk heterojunction (BHJ)-based photoactive layer has been favored over the planar heterojunction (PHJ)-based photoactive layer for organic photovoltaics (OPVs), owing to the evitable thickness limit of the latter induced by the low mobility of charge carriers. However, under dim indoor light conditions, the PV performance becomes immune to the resistive components of the PHJ OPVs, such as a thick photoactive layer, thereby rendering them attractive for operating indoors. In this study, we devise and demonstrate indoor OPVs with a PHJ-based photoactive layer constituting poly(3-hexylthiophene-2,5-diyl) (P3HT) and indene-C-60 bisadduct (ICBA). The performance of the PHJ OPVs was optimized by modulating the thickness of the ICBA layer under a 1000 lx light-emitting diode lamp. OPVs with a 65 nm-thick ICBA layer exhibited excellent indoor performance with a power conversion efficiency of 15.3 +/- 0.3%, comparable to that of the reference BHJ OPVs (15.0 +/- 0.2%). No noticeable performance degradation was observed by increasing the thickness of the PHJ-based photoactive layer; instead, a thick photoactive layer only enhanced the light absorption, resulting in excellent indoor performance with a higher photocurrent.
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Shim, Jae Won
공과대학 (전기전자공학부)
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