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Title: Amorphous TiO2 Compact Layers via ALD for Planar Halide Perovskite Photovoltaics

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [2];  [3];  [3];  [4];  [4];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Argonne-Northwestern Solar Energy Research (ANSER) Center, Evanston, IL (United States)
  2. Univ. of Illinois, Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab.
  3. Argonne-Northwestern Solar Energy Research (ANSER) Center, Evanston, IL (United States); Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Argonne-Northwestern Solar Energy Research (ANSER) Center, Evanston, IL (United States); Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
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A low temperature (< 120 °C) route to pinhole-free amorphous TiO2 compact layers may pave the way to more efficient, flexible, and stable inverted perovskite halide device designs. Toward this end, we utilize low-temperature thermal atomic layer deposition (ALD) to synthesize ultra-thin (12 nm) compact TiO2 underlayers for planar halide perovskite PV. While device performance with as-deposited TiO2 films is poor, we identify room temperature UV-O3 treatment as a route to device efficiency comparable to crystalline TiO2 thin films synthesized by higher temperature methods. Here, we further explore the chemical, physical, and interfacial properties 2 that might explain the improved performance through x-ray diffraction, spectroscopic ellipsometry, Raman spectroscopy, and x-ray photoelectron spectroscopy. These findings challenge our intuition about effective electron selective layers as well as point the way to a greater selection of flexible substrates and more stable inverted device designs.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; SC0001059
OSTI ID:
1352602
Journal Information:
ACS Applied Materials and Interfaces, Vol. 8, Issue 37; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 56 works
Citation information provided by
Web of Science

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Cited By (11)

Pinhole-free TiO 2 /Ag (O) /ZnO configuration for flexible perovskite solar cells with ultralow optoelectrical loss journal January 2019
To Be Higher and Stronger—Metal Oxide Electron Transport Materials for Perovskite Solar Cells journal August 2019
Atomic layer deposition (ALD) of nanoscale coatings on SrAl 2 O 4 ‐based phosphor powders to prevent aqueous degradation journal February 2020
Energy Level Alignment at Interfaces in Metal Halide Perovskite Solar Cells journal July 2018
Thermodynamically self-organized hole transport layers for high-efficiency inverted-planar perovskite solar cells journal January 2017
Metal Oxide Charge Transport Layers for Efficient and Stable Perovskite Solar Cells journal June 2019
Improved Reproducibility of PbS Colloidal Quantum Dots Solar Cells Using Atomic Layer–Deposited TiO 2 journal September 2019
Low-Temperature Soft-Cover-Assisted Hydrolysis Deposition of Large-Scale TiO2 Layer for Efficient Perovskite Solar Modules journal April 2018
Optimization of TiO 2 compact layer formed by atomic layer deposition for efficient perovskite solar cells journal November 2019
Energy Level Alignment at Interfaces in Metal Halide Perovskite Solar Cells journal March 2020
Improved Reproducibility of PbS Colloidal Quantum Dots Solar Cells Using Atomic Layer-Deposited TiO2 text January 2020

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Related Subjects

14 SOLAR ENERGY
amorphous titanium dioxide
atomic layer deposition
hybrid perovskites
low temperature processing
solar energy conversion