2016年7月
Free Carriers versus Excitons in CH3NH3PbI3 Perovskite Thin Films at Low Temperatures: Charge Transfer from the Orthorhombic Phase to the Tetragonal Phase
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
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- 巻
- 7
- 号
- 13
- 開始ページ
- 2316
- 終了ページ
- 2321
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acs.jpclett.6b00781
- 出版者・発行元
- AMER CHEMICAL SOC
We have investigated the dynamic optical properties of CH3NH3PbI3 (MAPbI(3)) perovskite thin films at low temperatures using time-resolved photoluminescence, optical transient absorption (TA), and THz TA spectroscopy. Optical spectroscopic results indicate that the high-temperature tetragonal phase still remains in the MAPbI(3) thin films at low temperatures in addition to the major orthorhombic phase. The fast charge transfer from the orthorhombic phase to the tetragonal phase is likely to suppress the formation of excitons in the orthorhombic phase. Consequently, the near-band-edge optical responses of the photocarriers in both the tetragonal and orthorhombic phases of the MAPbI(3) thin films are more accurately described by a free carrier model, rather than an excitonic model even at low temperatures.
- リンク情報
- ID情報
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- DOI : 10.1021/acs.jpclett.6b00781
- ISSN : 1948-7185
- Web of Science ID : WOS:000379457400004