Improved performance of dye-sensitized solar cells using dual-function TiO2 nanowire photoelectrode

Zico Alaia Akbar, Ji Hye Oh, Wisnu Tantyo Hadmojo, Su Ji Yang, Young Rag Do, Sung Yeong Jang

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

A unique, hierarchically structured, aggregated TiO2 nanowire (A-TiO2-nw) is prepared by solvothermal synthesis and used as a dualfunctioning photoelectrode in dye-sensitized solar cells (DSSCs). The A-TiO2- nw shows improved light scattering compared to conventional TiO2 nanoparticles (TiO2-np) and dramatically enhanced dye adsorption compared to conventional scattering particles (CSP). The A-TiO2-nw is used as a scattering layer for bilayer photoelectrodes (TiO2-np/A-TiO2-nw) in DSSCs to compare the cell performance to that of devices using state-ofthe- Art photoelectrode architectures (TiO2-np/CSP). The DSSCs fabricated using bilayers of TiO2-np/A-TiO2-nw show improved power conversion efficiency (9.1%) and current density (14.88 mA cm-2) compared to those using single-layer TiO2-np (7.6% and 11.84 mA cm-2) or TiO2-np/CSP bilayer structures (8.7% and 13.81 mA cm-2). The unique contribution of the A-TiO2-nw layers to the device performance is confirmed by studying the incident photon-to-current efficiency. The enhanced external quantum efficiencies at approximately 520 nm and 650 nm clearly reveal the dual functionality of A-TiO2-nw. These unique properties of A-TiO2-nw may be applied in other devices utilizing light-scattering n-type semiconductor.

Original languageEnglish
Pages (from-to)A1280-A1287
JournalOptics Express
Volume23
Issue number19
DOIs
Publication statusPublished - 21 Sept 2015

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