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
- Helmholtz-Center Berlin for Energy and Materials, Institute of Heterogeneous Materials, Hahn-Meitner-Platz 1, D-14109 Berlin (Germany)
- Department of Materials Science, Faculty of Science, Kasetsart University, Bangkok 10900 (Thailand)
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.
- OSTI ID:
- 22423751
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 23; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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