Title :
Indium Tin Oxide-Free Polymer Solar Cells: Microcavity Enhancing the Performance Using WO3/Au/WO3 as Transparent Electrode
Author :
Ping Shen ; Liang Shen ; Yongbing Long ; Geheng Chen
Author_Institution :
Coll. of Comput. Sci. & Eng., Changchun Univ. of Technol., Changchun, China
Abstract :
Recently, indium tin oxide (ITO)-free polymer solar cells (PSCs) have attracted increasing attention due to expensive ITO price caused by rare and valuable element-indium. Here, we fabricated and investigated ITO-free PSCs with the structure of glass/WO3/Au/WO3/poly (3-hexylthiophene): indene-C60 bisadduct (P3HT:ICBA)/LiF/Al. It is demonstrated that the power conversion efficiency of ITO-free devices with 85-nm-thick active layer is improved by 21.2% compared with that of ITO-based. The improvement is attributed to the first-order resonance and near-resonance of microcavity effect constructed between the Au anode and top Al cathode. The judgment is supported by the incident photon-to-electron conversion efficiency spectra test and optical simulation based on transfer matrix method, which reveal that the microcavity structure can enhance light absorption within two discrete wavelength ranges of 390-460 and 510-660 nm.
Keywords :
aluminium; electrochemical electrodes; glass; gold; lithium compounds; polymers; solar cells; tungsten compounds; ITO-free PSC; P3HT:ICBA; SiO2-WO3-Au-WO3-LiF-Al; anode; cathode; first-order resonance; glass-WO3-Au-WO3-poly (3-hexylthiophene):indene-C60 bisadduct-LiF-Al structure; incident photon-to-electron conversion efficiency spectra test; indium tin oxide-free polymer solar cells; light absorption enhancement; microcavity effect; microcavity structure; optical simulation; power conversion efficiency; transfer matrix method; transparent electrode; wavelength 390 nm to 460 nm; wavelength 510 nm to 660 nm; Absorption; Electrodes; Gold; Microcavities; Photovoltaic cells; Polymers; ITO-free; Microcavity; polymer solar cells;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2014.2357712
