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This content will become publicly available on November 16, 2018

Title: Effect of TiO 2 particle size and layer thickness on mesoscopic perovskite solar cells

Mesoporous TiO 2 (mp-TiO 2) layers are commonly used as electron transport layers in perovskite solar cells, which help to extract electrons from the perovskite light-absorbing layer and transport them to the electrodes. We investigated the effects of the layer thickness of mp-TiO 2 and particle size of TiO 2 on photovoltaic properties, in terms of the surface area of the mp-layer and the interfacial areas of the TiO 2 nanoparticles in the mp-layer. Various mp-TiO 2 layers with thicknesses of 150, 250, and 400 nm and particle sizes of 25 nm and 41 nm were prepared to compare the photovoltaic properties of such layer-containing perovskite solar cells. Time-resolved photoluminescence decay and impedance studies showed that interfacial resistance as well as perovskite-to-TiO 2 charge injection are important factors affecting photovoltaic performance. The deterioration of the photovoltaic parameters with increasing TiO 2/TiO 2 interfacial area also confirms that the interfacial series resistance that arises from these connections should be reduced to enhance the performance of mesoscopic perovskite solar cells.
 [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [2] ;  [4] ;  [1]
  1. Sungkyunkwan Univ., Suwon (Republic of Korea)
  2. Seoul National Univ. (Korea, Republic of); Global Frontier Center for Multiscale Energy Systems, Seoul (Korea, Republic of)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  4. Kyungpook National Univ., Daegu (Korea, Republic of)
Publication Date:
Report Number(s):
Journal ID: ISSN 0169-4332
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Applied Surface Science
Additional Journal Information:
Journal Name: Applied Surface Science; Journal ID: ISSN 0169-4332
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; perovskite solar cell; mesoporous TiO2; charge injection; charge transport; internal resistance
OSTI Identifier: