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Title: Performance enhancement of perovskite solar cells with Mg-doped TiO{sub 2} compact film as the hole-blocking layer

In this letter, we report perovskite solar cells with thin dense Mg-doped TiO{sub 2} as hole-blocking layers (HBLs), which outperform cells using TiO{sub 2} HBLs in several ways: higher open-circuit voltage (V{sub oc}) (1.08 V), power conversion efficiency (12.28%), short-circuit current, and fill factor. These properties improvements are attributed to the better properties of Mg-modulated TiO{sub 2} as compared to TiO{sub 2} such as better optical transmission properties, upshifted conduction band minimum (CBM) and downshifted valence band maximum (VBM), better hole-blocking effect, and higher electron life time. The higher-lying CBM due to the modulation with wider band gap MgO and the formation of magnesium oxide and magnesium hydroxides together resulted in an increment of V{sub oc}. In addition, the Mg-modulated TiO{sub 2} with lower VBM played a better role in the hole-blocking. The HBL with modulated band position provided better electron transport and hole blocking effects within the device.
Authors:
; ; ; ; ; ; ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, Department of Electronic Science and Technology, School of Physics and Technology, Wuhan University, Wuhan 430072 (China)
  2. (China)
  3. School of Physics and Electronic-Information Engineering, Hubei Engineering University, Xiaogan 432000 (China)
Publication Date:
OSTI Identifier:
22398756
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 30 DIRECT ENERGY CONVERSION; CHANNELING; COMPARATIVE EVALUATIONS; DEPLETION LAYER; DOPED MATERIALS; EFFICIENCY; ELECTRIC POTENTIAL; ELECTRONS; ENERGY CONVERSION; FILL FACTORS; FILMS; HOLES; MAGNESIUM HYDROXIDES; MAGNESIUM OXIDES; MODULATION; PERFORMANCE; PEROVSKITE; SOLAR CELLS; TITANIUM OXIDES; VALENCE