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 af dette arbejde

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

43 Citationer (Scopus)

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.

Originalsprog	Engelsk
Tidsskrift	Journal of Physical Chemistry Letters
Vol/bind	9
Udgave nummer	17
Sider (fra-til)	5017-5022
Antal sider	6
ISSN	1948-7185
DOI	https://doi.org/10.1021/acs.jpclett.8b02250
Status	Udgivet - 2018
Udgivet eksternt	Ja

Bibliografisk note

Publisher Copyright:
© 2018 American Chemical Society.

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Citationsformater

@article{aa2edccfac134fffb6acc9c6e8e8042f,

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 = "Funding Information: This work was financed by, the National Natural Science Foundation of China (Grant No: 21533010, 21321091, 21525315 and 91333116), the Ministry of Science and Technology of China (Grant 2017YFA0204800), the Swedish Research Council (VR), Swedish Energy Agency, Laserlab-Europe (EU-H2020 654148), NanoLund, the Carl Trygger Foundation, and the Knut and Alice Wallenberg Foundation. M.G. acknowledges a Wenner-Gren fellowship. Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

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

language = "English",

volume = "9",

pages = "5017--5022",

journal = "Journal of Physical Chemistry Letters",

issn = "1948-7185",

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TY - JOUR

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

N1 - Funding Information: This work was financed by, the National Natural Science Foundation of China (Grant No: 21533010, 21321091, 21525315 and 91333116), the Ministry of Science and Technology of China (Grant 2017YFA0204800), the Swedish Research Council (VR), Swedish Energy Agency, Laserlab-Europe (EU-H2020 654148), NanoLund, the Carl Trygger Foundation, and the Knut and Alice Wallenberg Foundation. M.G. acknowledges a Wenner-Gren fellowship. Publisher Copyright: © 2018 American Chemical Society.

PY - 2018

Y1 - 2018

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.

U2 - 10.1021/acs.jpclett.8b02250

DO - 10.1021/acs.jpclett.8b02250

M3 - Journal article

C2 - 30124049

AN - SCOPUS:85052958076

SN - 1948-7185

VL - 9

SP - 5017

EP - 5022

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 17

ER -