PbSe nanocrystal/conducting polymer solar cells with an infrared response to 2 micron

Xiaomei Jiang, Richard D. Schaller, Sergey B. Lee, Jeffrey M. Pietryga, Victor I. Klimov, Anvar A. Zakhidov

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

We investigated the photovoltaic response of nanocomposites made of colloidal, infrared-sensitive, PbSe nanocrystals (NCs) of various sizes and conjugated polymers of either regioregular poly (3-hexylthiophene) (RR-P3HT) or poly-(2-methoxy-5-(2-ethylhexoxy)-1,4-phenylene vinylene) (MEH-PPV). The conduction and valence energy levels of PbSe NCs were determined by cyclic voltammetry and revealed type II heterojunction alignment with respect to energy levels in RR-P3HT for smaller NC sizes. Devices composed of NCs and RR-P3HT show good diode characteristics and sizable photovoltaic response in a spectral range from the ultraviolet to the infrared. Using these materials, we have observed photovoltaic response at wavelengths as far to the infrared as 2 μm (0.6 eV), which is desirable due to potential benefits of carrier multiplication (or multi-exciton generation) from a single junction photovoltaic. Under reverse bias, the devices also exhibit good photodiode responses over the same spectral region.

Original languageEnglish
Pages (from-to)2204-2210
Number of pages7
JournalJournal of Materials Research
Volume22
Issue number8
DOIs
Publication statusPublished - Aug 1 2007

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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