Lim, Ju Won Hwang, Do Kyung Lim, Keun Yong Kang, Mingi Shin, Sang-Chul Kim, Hyun-Seok Choi, Won Kook Shim, Jae Won 2024-01-20T00:34:23Z 2024-01-20T00:34:23Z 2021-09-04 2017-09 0927-0248 https://pubs.kist.re.kr/handle/201004/122371 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. English Elsevier BV ZnO-morphology-dependent effects on the photovoltaic performance for inverted polymer solar cells Article 10.1016/j.solmat.2017.04.046 1 Solar Energy Materials and Solar Cells, v.169, pp.28 - 32 Solar Energy Materials and Solar Cells 169 28 32 N scie scopus 000403738700005 2-s2.0-85019157322 Energy & Fuels Materials Science, Multidisciplinary Physics, Applied Energy & Fuels Materials Science Physics Article TRANSPARENT CONDUCTING OXIDES CHARGE-COLLECTION LIGHT-SCATTERING NANOPARTICLES LAYERS FILMS Polymer solar cells Electron-collecting interlayers ZnO Morphology Optical effects Surface roughness