A Bi-layer TiO2 photoanode for highly durable, flexible dye-sensitized solar cells

Jianjian Lin, Yong Peng, Alexander R. Pascoe, Fuzhi Huang, Yi Bing Cheng, Yoon Uk Heo, Andrew Nattestad, Wanchul Seung, Sung Kyun Kim, Hoon Joon Yoon, Sang Woo Kim, Yusuke Yamauchi, Shi Xue Dou, Jung Ho Kim

Research output: Contribution to journalArticlepeer-review


Low-temperature processing of dye-sensitized solar cells (DSCs) [B. Oregan, M. Grätzel, Nature, 1991, 353, 737] is crucial to enable their commercialization with low-cost plastic substrates. Much of the previous work in this area has focused on mechanical compression of premade particles on plastic substrates; however, many reported that this technique did not yield sufficient interconnections for high charge carrier transport. Herein, we present bi-layer photoanodes that incorporate microstructured TiO2 sea-urchin-like assemblies, composed of high-aspect-ratio single crystalline nanoribbons, i.e., two-dimensional subunits, which were deposited onto a nanoparticle layer (commercial P25), with a 5.6% conversion efficiency realized. We demonstrate that this Mesoporous Hierarchical Anatase TiO2 (MHAT) nanostructure is beneficial due to its enhanced dye loading as well as enhanced light scattering. Importantly, we also show the benefits of a bi-layer structure where the nanoribbons penetrate into the nanoparticle layer (P25) after cold isostatic pressing (CIP), resulting in improved adhesion between the MHAT top layer and the P25 under layer on the indium tin oxide-coated polyethylene naphthalate (ITOPEN) substrate, leading to improved mechanical stability and durability, efficient electron transfer pathways, and ultimately, higher solar-to-electric conversion efficiencies.

Original languageEnglish
Pages (from-to)4679-4686
Number of pages8
JournalJournal of Materials Chemistry A
Issue number8
Publication statusPublished - 2015

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2015.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)


Dive into the research topics of 'A Bi-layer TiO2 photoanode for highly durable, flexible dye-sensitized solar cells'. Together they form a unique fingerprint.

Cite this