SpringerOpen Newsletter

Receive periodic news and updates relating to SpringerOpen.

Open Access Nano Express

Facile solution growth of vertically aligned ZnO nanorods sensitized with aqueous CdS and CdSe quantum dots for photovoltaic applications

Chunyan Luan12, Aleksandar Vaneski13, Andrei S Susha13, Xueqing Xu13, Hong-En Wang12, Xue Chen12, Jun Xu12, Wenjun Zhang12, Chun-Sing Lee12, Andrey L Rogach13* and Juan Antonio Zapien12*

Author affiliations

1 Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong SAR

2 Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Kowloon, Hong Kong SAR

3 Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon, Hong Kong SAR

For all author emails, please log on.

Citation and License

Nanoscale Research Letters 2011, 6:340  doi:10.1186/1556-276X-6-340

Published: 14 April 2011


Vertically aligned single crystalline ZnO nanorod arrays, approximately 3 μm in length and 50-450 nm in diameter are grown by a simple solution approach on a Zn foil substrate. CdS and CdSe colloidal quantum dots are assembled onto ZnO nanorods array using water-soluble nanocrystals capped as-synthesized with a short-chain bifuncional linker thioglycolic acid. The solar cells co-sensitized with both CdS and CdSe quantum dots demonstrate superior efficiency compared with the cells using only one type of quantum dots. A thin Al2O3 layer deposited prior to quantum dot anchoring successfully acts as a barrier inhibiting electron recombination at the Zn/ZnO/electrolyte interface, resulting in power conversion efficiency of approximately 1% with an improved fill factor of 0.55. The in situ growth of ZnO nanorod arrays in a solution containing CdSe quantum dots provides better contact between two materials resulting in enhanced open circuit voltage.