Improved photovoltaic performance of inverted polymer solar cells through a sol-gel processed Al-doped ZnO electron extraction layer

Jun Young Kim, Eunae Cho, Jaehoon Kim, Hyeonwoo Shin, Jeongkyun Roh, Mariyappan Thambidurai, Chan Mo Kang, Hyung Jun Song, Seong Min Kim, Hyeok Kim, Changhee Lee

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We demonstrate that nanocrystalline Al-doped zinc oxide (n-AZO) thin film used as an electron-extraction layer can significantly enhance the performance of inverted polymer solar cells based on the bulk heterojunction of poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] (PCDTBT) and [6,6]-phenyl C71-butyric acid methyl ester (PC70BM). A synergistic study with both simulation and experiment on n-AZO was carried out to offer a rational guidance for the efficiency improvement. As a result, An n-AZO film with an average grain size of 13 to 22 nm was prepared by a sol-gel spin-coating method, and a minimum resistivity of 2.1 × 10-3 Ωcm was obtained for an Al-doping concentration of 5.83 at.%. When an n-AZO film with a 5.83 at.% Al concentration was inserted between the ITO electrode and the active layer (PCDTBT:PC70BM), the power conversion efficiency increased from 3.7 to 5.6%.

Original languageEnglish
Pages (from-to)A1334-A1341
JournalOptics Express
Volume23
Issue number19
DOIs
StatePublished - 15 Sep 2015

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