High Resolution Mapping of Two-Photon Excited Photocurrent in Perovskite Microplate Photodetector
(2018) In Journal of Physical Chemistry Letters 9(17). p.5017-5022- 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... (More)
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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- author
- Yang, Bin ; Chen, Junsheng LU ; Shi, Qi LU ; Wang, Zhengjun LU ; Gerhard, Marina LU ; Dobrovolsky, Alexander LU ; Scheblykin, Ivan G. LU ; Karki, Khadga Jung LU ; Han, Keli and Pullerits, Tõnu LU
- organization
- publishing date
- 2018-09-06
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physical Chemistry Letters
- volume
- 9
- issue
- 17
- pages
- 6 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:85052958076
- pmid:30124049
- ISSN
- 1948-7185
- DOI
- 10.1021/acs.jpclett.8b02250
- language
- English
- LU publication?
- yes
- id
- e00e18ea-e027-471b-9535-4c7e11ec3b3f
- date added to LUP
- 2018-10-12 08:03:35
- date last changed
- 2024-05-27 18:54:00
@article{e00e18ea-e027-471b-9535-4c7e11ec3b3f, abstract = {{<p>We fabricate photodetectors based on solution-processed single CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> 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.</p>}}, author = {{Yang, Bin and Chen, Junsheng and Shi, Qi and Wang, Zhengjun and Gerhard, Marina and Dobrovolsky, Alexander and Scheblykin, Ivan G. and Karki, Khadga Jung and Han, Keli and Pullerits, Tõnu}}, issn = {{1948-7185}}, language = {{eng}}, month = {{09}}, number = {{17}}, pages = {{5017--5022}}, publisher = {{The American Chemical Society (ACS)}}, series = {{Journal of Physical Chemistry Letters}}, title = {{High Resolution Mapping of Two-Photon Excited Photocurrent in Perovskite Microplate Photodetector}}, url = {{http://dx.doi.org/10.1021/acs.jpclett.8b02250}}, doi = {{10.1021/acs.jpclett.8b02250}}, volume = {{9}}, year = {{2018}}, }