P-n junction from solution: Cuprous oxide p-n homojunction by electrodeposition

L. Wang, K. Han, X. Han, M. Tao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


Inorganic solar cells are traditionally fabricated by vacuum-based semiconductor processing. Although cuprous oxide (Cu2O) can be synthesized by wet-chemical methods, its natural p-type conductivity has prevented an efficient p-n homojunction solar cell. In this paper we report the effect of solution pH on the conduction type (n- or p-type) of Cu2O in electrodeposition. It is found that Cu2O electrodeposited at bath pH below 7.5 is n-type, while Cu2O deposited at bath pH above 9 is p-type. This is likely because bath pH controls the amount of oxygen incorporated into the growing Cu2O film and thus the nature of native point defects. Capacitance-voltage and photocurrent measurements confirm that the conduction type of Cu2O can be controlled by bath pH. X-ray diffraction and scanning electron microscopy reveal that while n-type Cu 2O deposited on Cu substrate appears amorphous, n-type Cu 2O deposited on p-type polycrystalline Cu2O is polycrystalline. Current-voltage measurements indicate that Al makes ohmic contacts to n-type Cu2O and Cu to p-type Cu2O. Furthermore, a two-step process is adopted to deposit p-type and n-type Cu 2O in sequence for the formation of a p-n homojunction in Cu 2O. Photocurrent and current-voltage characterization confirm that a p-n homojunction of Cu2O is achieved.

Original languageEnglish (US)
Title of host publication33rd IEEE Photovoltaic Specialists Conference, PVSC 2008
StatePublished - Dec 1 2008
Externally publishedYes
Event33rd IEEE Photovoltaic Specialists Conference, PVSC 2008 - San Diego, CA, United States
Duration: May 11 2008May 16 2008

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371


Other33rd IEEE Photovoltaic Specialists Conference, PVSC 2008
Country/TerritoryUnited States
CitySan Diego, CA

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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