Layer-by-layer assembly of sintered CdSe xTe 1-x nanocrystal solar cells

Brandon I MacDonald, Alessandro Martucci, Sergey Rubanov, Scott Edward Watkins, Paul C Mulvaney, Jacek Jaroslaw Jasieniak

Research output: Contribution to journalArticleResearchpeer-review

93 Citations (Scopus)

Abstract

Alloying is a versatile tool for engineering the optical and electronic properties of materials. Here, we explore the use of CdTe and CdSe nanocrystals in developing sintered CdSe xTe 1-x alloys as bandgap tunable, light-absorbing layers for solution-processed solar cells. Using a layer-by-layer approach, we incorporate such alloyed materials into single- and graded-composition device architectures. Nanostructured solar cells employing CdSe xTe 1-x layers are found to exhibit a spectral response deeper into the IR region than bulk CdTe devices as a result of optical bowing and achieve power conversion efficiencies as high as 7.1 . The versatility of the layer-by-layer approach is highlighted through the fabrication of compositionally graded solar cells in which the [Se]:[Te] ratio is varied across the device. Each of the individual layers can be clearly resolved through cross-sectional imaging and show limited interdiffusion. Such devices demonstrate the importance of band-alignment in the development of highly efficient, nanostructured solar cells.
Original languageEnglish
Pages (from-to)5995 - 6004
Number of pages10
JournalACS Nano
Volume6
Issue number7
DOIs
Publication statusPublished - 2012
Externally publishedYes

Cite this

MacDonald, B. I., Martucci, A., Rubanov, S., Watkins, S. E., Mulvaney, P. C., & Jasieniak, J. J. (2012). Layer-by-layer assembly of sintered CdSe xTe 1-x nanocrystal solar cells. ACS Nano, 6(7), 5995 - 6004. https://doi.org/10.1021/nn3009189
MacDonald, Brandon I ; Martucci, Alessandro ; Rubanov, Sergey ; Watkins, Scott Edward ; Mulvaney, Paul C ; Jasieniak, Jacek Jaroslaw. / Layer-by-layer assembly of sintered CdSe xTe 1-x nanocrystal solar cells. In: ACS Nano. 2012 ; Vol. 6, No. 7. pp. 5995 - 6004.
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MacDonald, BI, Martucci, A, Rubanov, S, Watkins, SE, Mulvaney, PC & Jasieniak, JJ 2012, 'Layer-by-layer assembly of sintered CdSe xTe 1-x nanocrystal solar cells', ACS Nano, vol. 6, no. 7, pp. 5995 - 6004. https://doi.org/10.1021/nn3009189

Layer-by-layer assembly of sintered CdSe xTe 1-x nanocrystal solar cells. / MacDonald, Brandon I; Martucci, Alessandro; Rubanov, Sergey; Watkins, Scott Edward; Mulvaney, Paul C; Jasieniak, Jacek Jaroslaw.

In: ACS Nano, Vol. 6, No. 7, 2012, p. 5995 - 6004.

Research output: Contribution to journalArticleResearchpeer-review

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AU - MacDonald, Brandon I

AU - Martucci, Alessandro

AU - Rubanov, Sergey

AU - Watkins, Scott Edward

AU - Mulvaney, Paul C

AU - Jasieniak, Jacek Jaroslaw

PY - 2012

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AB - Alloying is a versatile tool for engineering the optical and electronic properties of materials. Here, we explore the use of CdTe and CdSe nanocrystals in developing sintered CdSe xTe 1-x alloys as bandgap tunable, light-absorbing layers for solution-processed solar cells. Using a layer-by-layer approach, we incorporate such alloyed materials into single- and graded-composition device architectures. Nanostructured solar cells employing CdSe xTe 1-x layers are found to exhibit a spectral response deeper into the IR region than bulk CdTe devices as a result of optical bowing and achieve power conversion efficiencies as high as 7.1 . The versatility of the layer-by-layer approach is highlighted through the fabrication of compositionally graded solar cells in which the [Se]:[Te] ratio is varied across the device. Each of the individual layers can be clearly resolved through cross-sectional imaging and show limited interdiffusion. Such devices demonstrate the importance of band-alignment in the development of highly efficient, nanostructured solar cells.

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MacDonald BI, Martucci A, Rubanov S, Watkins SE, Mulvaney PC, Jasieniak JJ. Layer-by-layer assembly of sintered CdSe xTe 1-x nanocrystal solar cells. ACS Nano. 2012;6(7):5995 - 6004. https://doi.org/10.1021/nn3009189