期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 23, 页码 14717-14724出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03619
关键词
organic solar cells; oxide interlayer; organic/cathode interface; subgap states; charge collection
资金
- Research Grants Council of Hong Kong Special Administrative Region, China [T23-713/11, GRF12303114]
- National Natural Science Foundation of China [61275037]
- Research Grants Council of Hong Kong [211913]
Organic solar cells (OSCs) with inverted structure usually exhibit higher power conversion efficiency (PCE) and are more stable than corresponding devices with regular configuration. Indium tin oxide (ITO) surface is often modified with solution-processed low work function metal oxides, such as ZnO, serving as the transparent cathode. However, the defect-induced subgap states in the ZnO interlayer hamper the efficient charge collection and the performance reproducibility of the OSCs. In this work, we demonstrate that suppression of the ZnO subgap states by modification of its, surface with an ultrathin Al layer significantly improves the charge extraction and performance reproducibility, achieving PCE of 8.0%, which is similar to 15% higher than that of a structurally identical control cell made with a pristine ZnO interlayer, Light intensity-dependent current density voltage characteristic, photothermal deflection spectroscopy, and X-ray photoelectron spectroscopy measurements point out the enhancement of charge collection efficiency at the organic/cathode interface, due to the suppression of the subgap states in the ZnO interlayer.
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