Undoped ZnO electrodes for low-cost indoor organic photovoltaics
- Authors
- Goo, Ji Soo; Lee, Jung-Hoon; Shin, Sang-Chul; Park, Jin-Seong; Shim, Jae Won
- Issue Date
- Dec-2018
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.46, pp.23464 - 23472
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 6
- Number
- 46
- Start Page
- 23464
- End Page
- 23472
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/15263
- DOI
- 10.1039/c8ta08432g
- ISSN
- 2050-7488
- Abstract
- The unique features of organic photovoltaics (OPVs) offer great potential for their use as indoor energy harvesters. Here, we demonstrate for the first time the use of a low-cost undoped ZnO film for the transparent conducting electrode (TCE) of OPVs. Atomic layer deposition was employed to produce potentially defect-free and crystalline ZnO films. Poly(3-hexylthiophene) (P3HT):indene-C-60 bisadduct (ICBA)-based OPVs with 200 nm-thick ZnO TCEs were shown to hardly operate under 1 sun conditions due to the high sheet resistance (R-SH) of the ZnO film (260 sq(-1)). Surprisingly, the indoor performance of the OPVs was found to be barely dependent on the R-SH of the TCEs; rather, other factors such as leakage components associated with the shunt resistance were found to have a greater influence on the performance. The OPVs exhibited excellent indoor performance with a power-conversion efficiency (PCE) of 9.5 +/- 0.3% under a light emitting diode lamp with a luminance of 500 lux. The measured PCE was slightly higher than or comparable to that of reference devices with a 200 nm-thick ITO TCE. Finally, the ZnO TCE is expected to result in more than 20% cost reduction of the OPVs when compared with the ITO TCE.
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