Impact of Excess CH3NH3I on Free Carrier Dynamics in High-Performance Nonstoichiometric Perovskites

Sujin Ham, Yung Ji Choi, Jin Wook Lee, Nam Gyu Park, Dongho Kim

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Since the discovery of organometallic trihalide perovskites, there have been tremendous efforts to exploit these hybrid materials and understand their optoelectronic properties for the development of solar cells with high power conversion efficiencies. Although the improved performance of perovskite solar cells with excess CH3NH3I has been reported, the dedicated research of the free charge carrier dynamics is lacking. In this study, we measured the photoluminescence (PL) intensities and lifetimes at the grains and near the grain boundaries of CH3NH3PbI3 perovskite films using spatially and temporally resolved PL spectroscopy. An excess CH3NH3I was found to cause brighter PL intensities and longer PL lifetimes at both the grains and grain boundaries. This comparative investigation of stoichiometric and nonstoichiometric perovskite films enables us to understand the optoelectronic properties induced by excess CH3NH3I, opening a new way for optimization of perovskite solar cells.
Original languageEnglish
Pages (from-to)3143-3148
Number of pages6
JournalJournal of Physical Chemistry C
Volume121
Issue number5
DOIs
Publication statusPublished - 2017 Feb 9

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perovskites
Photoluminescence
photoluminescence
Optoelectronic devices
Perovskite
solar cells
Grain boundaries
Photoluminescence spectroscopy
grain boundaries
Hybrid materials
Organometallics
Charge carriers
life (durability)
Conversion efficiency
Solar cells
charge carriers
optimization
causes
spectroscopy
Perovskite solar cells

Cite this

Ham, Sujin ; Choi, Yung Ji ; Lee, Jin Wook ; Park, Nam Gyu ; Kim, Dongho. / Impact of Excess CH3NH3I on Free Carrier Dynamics in High-Performance Nonstoichiometric Perovskites. In: Journal of Physical Chemistry C. 2017 ; Vol. 121, No. 5. pp. 3143-3148.
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Impact of Excess CH3NH3I on Free Carrier Dynamics in High-Performance Nonstoichiometric Perovskites. / Ham, Sujin; Choi, Yung Ji; Lee, Jin Wook; Park, Nam Gyu; Kim, Dongho.

In: Journal of Physical Chemistry C, Vol. 121, No. 5, 09.02.2017, p. 3143-3148.

Research output: Contribution to journalArticle

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AB - Since the discovery of organometallic trihalide perovskites, there have been tremendous efforts to exploit these hybrid materials and understand their optoelectronic properties for the development of solar cells with high power conversion efficiencies. Although the improved performance of perovskite solar cells with excess CH3NH3I has been reported, the dedicated research of the free charge carrier dynamics is lacking. In this study, we measured the photoluminescence (PL) intensities and lifetimes at the grains and near the grain boundaries of CH3NH3PbI3 perovskite films using spatially and temporally resolved PL spectroscopy. An excess CH3NH3I was found to cause brighter PL intensities and longer PL lifetimes at both the grains and grain boundaries. This comparative investigation of stoichiometric and nonstoichiometric perovskite films enables us to understand the optoelectronic properties induced by excess CH3NH3I, opening a new way for optimization of perovskite solar cells.

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