Solution-processed sintered nanocrystal solar cells via layer-by-layer assembly

Jacek Jaroslaw Jasieniak, Brandon I MacDonald, Scott Edward Watkins, Paul C Mulvaney

Research output: Contribution to journalArticleResearchpeer-review

154 Citations (Scopus)

Abstract

Solar cells made by high temperature and vacuum processes from inorganic semiconductors are at a perceived cost disadvantage when compared with solution-processed systems such as organic and dye-sensitized solar cells. We demonstrate that totally solution processable solar cells can be fabricated from inorganic nanocrystal inks in air at temperature as low as 300 ?C. Focusing on a CdTe/ZnO thin-film system, we report solar cells that achieve power conversion efficiencies of 6.9 with greater than 90 internal quantum efficiency. In our approach, nanocrystals are deposited from solution in a layer-by-layer process. Chemical and thermal treatments between layers induce large scale grain formation, turning the 4 nm CdTe particles into pinhole-free films with an optimized average crystallite size of 70 nm. Through capacitance-voltage measurements we demonstrate that the CdTe layer is fully depleted which enables the charge carrier collection to be maximized.
Original languageEnglish
Pages (from-to)2856 - 2864
Number of pages9
JournalNano Letters
Volume11
Issue number7
DOIs
Publication statusPublished - 2011
Externally publishedYes

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