Publication date: 1st July 2014
Albeit high-quality QDs can be feasibly obtained relying on the well-developed organometallic high-temperature synthetic route, it is still a great challenge to immobilize the pre-prepared QDs on mesoporous oxide film electrodes with a high surface coverage. A postsynthesis assembly approach, ex situ ligand exchange route, has been developed for the effective deposition of QDs sensitizers (including CdSe, CdS/CdSe, CdSexTe1-x, and type-II CdTe/CdSe QDs) on TiO2 mesoporous film and Power Conversion Eefficiencies (PCE) of 5.42%, 5.32%, 6.36% and 6.76% are obtained for corresponding cell devices, respectively.1-4 Linker molecules mercaptopropionic acid (MPA) capped water-soluble QDs were prepared via ex situ ligand exchange form the initial oil-soluble QDs and then immobilized on TiO2 film electrodes with coverage of 34% by immersion the electrode into MPA-capped QD aqueous dispersions. The uniformity of QD deposition throughout the film thickness is confirmed by the elemental mapping technique and also by the nearly constant Cd/Ti ratio within the cross-section of the film. The type-II CdTe/CdSe QD based sensitized solar cells show a record efficiency of 6.76% under simulated AM 1.5 G, full 1 sun illumination was obtained, which is the highest reported to date for liquid junction QDSC. This result situates the sensitized technology in the same range of efficiencies reported with other QD solar cell configurations. Furthermore, a PCE up to 7.04%, and a certified PCE of 6.66% has been obtained on the Cd-, Pb-free “green” CuInS2 QD based QDSC.5 These encouraging PCE values indicate the promising future for the QDSC with simple configuration.
References:
1. J. Wang, I. Mora-Sero, Z. Pan, K. Zhao, H. Zhang, Y. Feng, G. Yang, X. Zhong, J. Bisquert J. Am. Chem. Soc. 2013, 135, 15913.2. Z. Pan, H. Zhang, K. Chen, Y. Hou, J. Hua, X. Zhong ACS Nano 2012, 6, 3982.3. H. Zhang, K. Chen, Y.M. Hou, Z. Fang, X. Pan, W.J. Wu, J. L. Hua, X. Zhong Chem. Commun. 2012, 48, 11235.4. Z. Pan, K. Zhao, J. Wang, H. Zhang, Y. Feng, X. Zhong ACS Nano 2013, 7, 2115.5. Z. Pan, I. Mora-Sero, Q. Shen, H. Zhang, Y. Li, K. Zhao, X. Zhong, J. Bisquert, Submitted.
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