ZnO-morphology-dependent effects on the photovoltaic performance for inverted polymer solar cells
- ZnO-morphology-dependent effects on the photovoltaic performance for inverted polymer solar cells
- 최원국; 황도경; 임근용; 임주원; 강민기; 신상철; 김현석; 심재원
- Polymer solar cells; Electron-collecting interlayers; ZnO; Morphology; Optical effects; Surface roughness
- Issue Date
- Solar energy materials and solar cells
- VOL 169-32
- We report on the effects of zinc oxide (ZnO) morphology on the photovoltaic performance of inverted polymer solar cells (PSCs). Three different ZnO layers, fabricated from a sol– gel, nanoparticles (NPs), or nanorods (NRs), were employed as electron-collecting interlayers (ECIs) to compare their electrical, morphological, and optical properties in poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-bA]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]-thiophenediyl] (PTB7): [6,6]-phenyl-C70-butyric acid methyl ester (PC70BM)-based inverted PSCs. The work functions of all the ZnO layers were lower than or similar to the electron affinity of the acceptor, PC70BM, allowing the ZnO-coated indium tin oxide (ITO) substrates to act as efficient electron-collecting electrodes. The ZnO NRs induced not only stronger scattering effects but also more efficient electron collection than those of the devices with ZnO sol‒ gel or NP ECIs, resulting in enhanced external quantum efficiency and, consequently, the highest power conversion efficiency (8.38±0.09%) under illumination (AM 1.5G, 100 mW/cm2). The optical effects of the ZnO NRs were confirmed by a finite-difference time-domain simulation.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.