skip to main content

Title: Role of phase composition for electronic states in CH{sub 3}NH{sub 3}PbI{sub 3} prepared from CH{sub 3}NH{sub 3}I/PbCl{sub 2} solution

Modulated surface photovoltage (SPV) spectra have been correlated with the phase composition in layers of CH{sub 3}NH{sub 3}PbI{sub 3} (MAPbI{sub 3}) prepared from MAI and PbCl{sub 2} and annealed at 100 °C. Depending on the annealing time, different compositions of MAPbI{sub 3}, MAPbCl{sub 3}, MACl, PbI{sub 2}, and an un-identified phase were found. It has been demonstrated that evaporation of MAI and HI is crucial for the development of electronic states in MAPbI{sub 3} and that only the appearance and evolution of the phase PbI{sub 2} has an influence on electronic states in MAPbI{sub 3}. With ongoing annealing, (i) a transition from p- to n-type doping was observed with the appearance of PbI{sub 2}, (ii) shallow acceptor states were distinguished and disappeared in n-type doped MAPbI{sub 3}, and (iii) a minimum of the SPV response related to deep defect states was found at the transition from p- to n-type doping. The results are discussed with respect to the further development of highly efficient and stable MAPbI{sub 3} absorbers for solar cells.
Authors:
;  [1] ;  [2] ; ;  [1] ;  [3]
  1. Helmholtz-Center Berlin for Energy and Materials, Institute of Heterogeneous Materials, Hahn-Meitner-Platz 1, D-14109 Berlin (Germany)
  2. (Thailand)
  3. Department of Materials Science, Faculty of Science, Kasetsart University, Bangkok 10900 (Thailand)
Publication Date:
OSTI Identifier:
22423751
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 23; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AMMONIUM COMPOUNDS; ANNEALING; DOPED MATERIALS; ELECTRONIC STRUCTURE; LAYERS; LEAD CHLORIDES; LEAD IODIDES; MATHEMATICAL SOLUTIONS; PEROVSKITES; SOLAR CELLS