Efficient Steplike Carrier Multiplication in Percolative Networks of Epitaxially Connected PbSe Nanocrystals | Zendy

Aditya Kulkarni | Zendy; Wiel H. Evers | Zendy; Stanko Tomić | Zendy; Matthew C. Beard | Zendy; Daniël Vanmaekelbergh | Zendy; Laurens D. A. Siebbeles | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Efficient Steplike Carrier Multiplication in Percolative Networks of Epitaxially Connected PbSe Nanocrystals

Author(s) -

Aditya Kulkarni,

Wiel H. Evers,

Stanko Tomić,

Matthew C. Beard,

Daniël Vanmaekelbergh,

Laurens D. A. Siebbeles

Publication year - 2017

Publication title -

acs nano

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.554

H-Index - 382

eISSN - 1936-086X

pISSN - 1936-0851

DOI - 10.1021/acsnano.7b06511

Subject(s) - multiple exciton generation , materials science , optoelectronics , energy conversion efficiency , solar cell , band gap , solar cell efficiency , photon , nanocrystal , epitaxy , semiconductor , quantum efficiency , electron , photon energy , thin film , nanotechnology , optics , physics , layer (electronics) , quantum mechanics

Carrier multiplication (CM) is a process in which a single photon excites two or more electrons. CM is of interest to enhance the efficiency of a solar cell. Until now, CM in thin films and solar cells of semiconductor nanocrystals (NCs) has been found at photon energies well above the minimum required energy of twice the band gap. The high threshold of CM strongly limits the benefits for solar cell applications. We show that CM is more efficient in a percolative network of directly connected PbSe NCs. The CM threshold is at twice the band gap and increases in a steplike fashion with photon energy. A lower CM efficiency is found for a solid of weaker coupled NCs. This demonstrates that the coupling between NCs strongly affects the CM efficiency. According to device simulations, the measured CM efficiency would significantly enhance the power conversion efficiency of a solar cell.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research