Layer-by-Layer Assembly of Sintered CdSexTe1鈥?i>x Nanocrystal Solar Cells
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- 作者：Brandon I. MacDonald ; Alessandro Martucci ; Sergey Rubanov ; Scott E. Watkins ; Paul Mulvaney ; Jacek J. Jasieniak
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：July 24, 2012
- 年：2012
- 卷：6
- 期：7
- 页码：5995-6004
- 全文大小：608K
- 年卷期：v.6,no.7(July 24, 2012)
- ISSN：1936-086X
文摘
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 CdSexTe1鈥?i>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 CdSexTe1鈥?i>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.