Details

Autor(en) / Beteiligte

• Lee, Hye-Min
• Kim, Seok-Soon
• Kim, Han-Ki

Titel

Artificially MoO3 graded ITO anodes for acidic buffer layer free organic photovoltaics

Ist Teil von

• Applied surface science, 2016-02, Vol.364, p.340-348

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •Characteristics of MoO3-graded ITO electrode were investigated for organic solar cells (OSCs).•The effect of top MoO3 layer on properties of MoO3-graded ITO films was investigated.•MoO3-graded ITO film eliminates the use of acidic PEDOT:PSS layer for OSCs. We report characteristics of MoO3 graded ITO anodes prepared by a RF/DC graded sputtering for acidic poly(3,4-ethylene dioxylene thiophene):poly(styrene sulfonic acid) (PEDOT:PSS)-free organic solar cells (OSCs). Graded sputtering of the MoO3 buffer layer on top of the ITO layer produced MoO3 graded ITO anodes with a sheet resistance of 12.67Ω/square, a resistivity of 2.54×10−4Ωcm, and an optical transmittance of 86.78%, all of which were comparable to a conventional ITO anode. In addition, the MoO3 graded ITO electrode showed a greater work function of 4.92eV than that (4.6eV) of an ITO anode, which is beneficial for hole extraction from an organic active layer. Due to the high work function of MoO3 graded ITO electrodes, the acidic PEDOT:PSS-free OSCs fabricated on the MoO3 graded ITO electrode exhibited a power conversion efficiency 3.60% greater than that of a PEDOT:PSS-free OSC on the conventional ITO anode. The successful operation of PEDOT:PSS-free OSCs indicates simpler fabrication steps for cost-effective OSCs and elimination of interfacial reactions caused by the acidic PEDOT:PSS layer for reliable OSCs.