Comparative Properties Investigations of Organic Doped Hybrid-Perovskite Solar Cells

Abstract

The intermediate-dimensional hybrid mixed-organic perovskite active layers PEA₂(CH₃NH₃)_n−1(PbI₂)_n and Dodec₂(CH₃NH₃)_n−1(PbI₂)_n with various n values were successfully fabricated. Their characteristics were compared to find out a promising candidate for solar cell applications. The appropriate layer thickness of the films was tuned by a variation of n values based on stoichiometry. The physical appearance, crystal structure, surface morphology, chemical bonding, optical properties, stability to the heat and humidity, and power conversion efficiency of all films were examined thoroughly to determine their potential. For low n values of both film types, they showed the quasi-2D characteristic improving the film stability and conversion efficiency. The absorption edge of both types of materials shifted to a higher energy side and the electronic band gap increased with the decrease of n values. The mixed phase and MAPbI₃ perovskite diffraction peaks were still observable even after time has passed for 72 h. Under the 60% humidity condition, the PEA-doped MAPbI₃ films decomposed slower than the Dodec-doped MAPbI₃ films.

Keywords:

• Perovskite
• MAPbI₃
• hybrid
• PEA
• Dodec

Disclosure Statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was financially supported by Silpakorn University Research, Innovation and Creative Fund (Fiscal Year 2018).