High Resolution Mapping of Two-Photon Excited Photocurrent in Perovskite Microplate Photodetector

Bin Yang; Junsheng Chen; Qi Shi; Zhengjun Wang; Marina Gerhard; Alexander Dobrovolsky; Ivan G. Scheblykin; Khadga Jung Karki; Keli Han; Tõnu Pullerits

doi:10.1021/acs.jpclett.8b02250

High Resolution Mapping of Two-Photon Excited Photocurrent in Perovskite Microplate Photodetector

Bin Yang, Junsheng Chen, Qi Shi, Zhengjun Wang, Marina Gerhard, Alexander Dobrovolsky, Ivan G. Scheblykin, Khadga Jung Karki^*, Keli Han, Tõnu Pullerits

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

We fabricate photodetectors based on solution-processed single CH₃NH₃PbBr₃ microcrystals (MCs) and map the two-photon absorption (TPA) excited photocurrent (PC) with spatial resolution of 1 μm. We find that the charge carrier transport length in the MCs depends on the applied electric field, and increases from 5.7 μm for 0.02 V bias (dominated by carrier diffusion) to 23.2 μm for 2 V bias (dominated by carrier drift). Furthermore, PC shows strong spatial variations. Combining the PC mapping results with time-resolved photoluminescence microscopy, we demonstrate that the spatial distribution of PC mainly originates from the inhomogeneous distribution of trap-states across perovskite MCs. This suggests that there is still large margin for improvement of perovskite single crystal devices by better controlling of the traps.

Original language	English
Pages (from-to)	5017-5022
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	9
Issue number	17
DOIs	https://doi.org/10.1021/acs.jpclett.8b02250
State	Published - 6 Sep 2018
Externally published	Yes

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title = "High Resolution Mapping of Two-Photon Excited Photocurrent in Perovskite Microplate Photodetector",

abstract = "We fabricate photodetectors based on solution-processed single CH3NH3PbBr3 microcrystals (MCs) and map the two-photon absorption (TPA) excited photocurrent (PC) with spatial resolution of 1 μm. We find that the charge carrier transport length in the MCs depends on the applied electric field, and increases from 5.7 μm for 0.02 V bias (dominated by carrier diffusion) to 23.2 μm for 2 V bias (dominated by carrier drift). Furthermore, PC shows strong spatial variations. Combining the PC mapping results with time-resolved photoluminescence microscopy, we demonstrate that the spatial distribution of PC mainly originates from the inhomogeneous distribution of trap-states across perovskite MCs. This suggests that there is still large margin for improvement of perovskite single crystal devices by better controlling of the traps.",

author = "Bin Yang and Junsheng Chen and Qi Shi and Zhengjun Wang and Marina Gerhard and Alexander Dobrovolsky and Scheblykin, {Ivan G.} and Karki, {Khadga Jung} and Keli Han and T{\~o}nu Pullerits",

note = "Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

month = sep,

day = "6",

doi = "10.1021/acs.jpclett.8b02250",

language = "英语",

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T1 - High Resolution Mapping of Two-Photon Excited Photocurrent in Perovskite Microplate Photodetector

AU - Yang, Bin

AU - Chen, Junsheng

AU - Shi, Qi

AU - Wang, Zhengjun

AU - Gerhard, Marina

AU - Dobrovolsky, Alexander

AU - Scheblykin, Ivan G.

AU - Karki, Khadga Jung

AU - Han, Keli

AU - Pullerits, Tõnu

PY - 2018/9/6

Y1 - 2018/9/6

N2 - We fabricate photodetectors based on solution-processed single CH3NH3PbBr3 microcrystals (MCs) and map the two-photon absorption (TPA) excited photocurrent (PC) with spatial resolution of 1 μm. We find that the charge carrier transport length in the MCs depends on the applied electric field, and increases from 5.7 μm for 0.02 V bias (dominated by carrier diffusion) to 23.2 μm for 2 V bias (dominated by carrier drift). Furthermore, PC shows strong spatial variations. Combining the PC mapping results with time-resolved photoluminescence microscopy, we demonstrate that the spatial distribution of PC mainly originates from the inhomogeneous distribution of trap-states across perovskite MCs. This suggests that there is still large margin for improvement of perovskite single crystal devices by better controlling of the traps.

AB - We fabricate photodetectors based on solution-processed single CH3NH3PbBr3 microcrystals (MCs) and map the two-photon absorption (TPA) excited photocurrent (PC) with spatial resolution of 1 μm. We find that the charge carrier transport length in the MCs depends on the applied electric field, and increases from 5.7 μm for 0.02 V bias (dominated by carrier diffusion) to 23.2 μm for 2 V bias (dominated by carrier drift). Furthermore, PC shows strong spatial variations. Combining the PC mapping results with time-resolved photoluminescence microscopy, we demonstrate that the spatial distribution of PC mainly originates from the inhomogeneous distribution of trap-states across perovskite MCs. This suggests that there is still large margin for improvement of perovskite single crystal devices by better controlling of the traps.

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U2 - 10.1021/acs.jpclett.8b02250

DO - 10.1021/acs.jpclett.8b02250

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SN - 1948-7185

VL - 9

SP - 5017

EP - 5022

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 17

ER -

High Resolution Mapping of Two-Photon Excited Photocurrent in Perovskite Microplate Photodetector

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