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Title: Visualizing Buried Local Carrier Diffusion in Halide Perovskite Crystals via Two-Photon Microscopy

Abstract

Halide perovskites have shown great potential for light emission and photovoltaic applications due to their remarkable electronic properties. Although the device performances are promising, they are still limited by microscale heterogeneities in their photophysical properties. Here, we study the impact of these heterogeneities on the diffusion of charge carriers, which are processes crucial for efficient collection of charges in light-harvesting devices. A photoluminescence tomography technique is developed in a confocal microscope using one- and two-photon excitation to distinguish between local surface and bulk diffusion of charge carriers in methylammonium lead bromide single crystals. We observe a large dispersion of local diffusion coefficients with values between 0.3 and 2 cm 2·s -1 depending on the trap density and the morphological environment a distribution that would be missed from analogous macroscopic or surface measurements. This work reveals a new framework to understand diffusion pathways, which are extremely sensitive to local properties and buried defects.

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [2];  [3]; ORCiD logo [1]
  1. Univ. of Cambridge (United Kingdom)
  2. King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Univ. of Cambridge (United Kingdom)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1579455
Alternate Identifier(s):
OSTI ID: 1582584
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Stavrakas, Camille, Delport, Géraud, Zhumekenov, Ayan A., Anaya, Miguel, Chahbazian, Rosemonde, Bakr, Osman M., Barnard, Edward S., and Stranks, Samuel D. Visualizing Buried Local Carrier Diffusion in Halide Perovskite Crystals via Two-Photon Microscopy. United States: N. p., 2019. Web. doi:10.1021/acsenergylett.9b02244.
Stavrakas, Camille, Delport, Géraud, Zhumekenov, Ayan A., Anaya, Miguel, Chahbazian, Rosemonde, Bakr, Osman M., Barnard, Edward S., & Stranks, Samuel D. Visualizing Buried Local Carrier Diffusion in Halide Perovskite Crystals via Two-Photon Microscopy. United States. doi:10.1021/acsenergylett.9b02244.
Stavrakas, Camille, Delport, Géraud, Zhumekenov, Ayan A., Anaya, Miguel, Chahbazian, Rosemonde, Bakr, Osman M., Barnard, Edward S., and Stranks, Samuel D. Wed . "Visualizing Buried Local Carrier Diffusion in Halide Perovskite Crystals via Two-Photon Microscopy". United States. doi:10.1021/acsenergylett.9b02244.
@article{osti_1579455,
title = {Visualizing Buried Local Carrier Diffusion in Halide Perovskite Crystals via Two-Photon Microscopy},
author = {Stavrakas, Camille and Delport, Géraud and Zhumekenov, Ayan A. and Anaya, Miguel and Chahbazian, Rosemonde and Bakr, Osman M. and Barnard, Edward S. and Stranks, Samuel D.},
abstractNote = {Halide perovskites have shown great potential for light emission and photovoltaic applications due to their remarkable electronic properties. Although the device performances are promising, they are still limited by microscale heterogeneities in their photophysical properties. Here, we study the impact of these heterogeneities on the diffusion of charge carriers, which are processes crucial for efficient collection of charges in light-harvesting devices. A photoluminescence tomography technique is developed in a confocal microscope using one- and two-photon excitation to distinguish between local surface and bulk diffusion of charge carriers in methylammonium lead bromide single crystals. We observe a large dispersion of local diffusion coefficients with values between 0.3 and 2 cm2·s-1 depending on the trap density and the morphological environment a distribution that would be missed from analogous macroscopic or surface measurements. This work reveals a new framework to understand diffusion pathways, which are extremely sensitive to local properties and buried defects.},
doi = {10.1021/acsenergylett.9b02244},
journal = {ACS Energy Letters},
number = 1,
volume = 5,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1021/acsenergylett.9b02244

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