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Enhanced Performance of p‐Type Dye‐Sensitized Solar Cells Based on Ultrasmall Mg‐Doped CuCrO 2 Nanocrystals
Author(s) -
Xiong Dehua,
Zhang Wenjun,
Zeng Xianwei,
Xu Zhen,
Chen Wei,
Cui Jin,
Wang Mingkui,
Sun Licheng,
Cheng YiBing
Publication year - 2013
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201300265
Subject(s) - dye sensitized solar cell , non blocking i/o , materials science , nanocrystalline material , doping , delafossite , crystallite , nanocrystal , analytical chemistry (journal) , open circuit voltage , nanotechnology , optoelectronics , chemistry , oxide , electrode , voltage , metallurgy , chromatography , quantum mechanics , electrolyte , catalysis , biochemistry , physics
Herein, we present ultrasmall delafossite‐type Mg‐doped CuCrO 2 nanocrystals prepared by using hydrothermal synthesis and their first application as photocathodes in efficient p‐type dye‐sensitized solar cells. The short‐circuit current density ( J sc ) is notably increased by approximately 27 % owing to the decreased crystallite size and the enhanced optical transmittance associated with Mg doping of the CuCrO 2 nanocrystalline sample. An open‐circuit voltage ( V oc ) of 201 mV, J sc of 1.51 mA cm −2 , fill factor of 0.449, and overall photoconversion efficiency of 0.132 % have been achieved with the CuCr 0.9 Mg 0.1 O 2 dye photocathode sensitized with the P1 dye under optimized conditions. This efficiency is nearly three times higher than that of the NiO‐based reference device, which is attributed to the largely improved V oc and J sc . The augmentation of V oc and J sc can be attributed to the lower valance band position and the faster hole diffusion coefficient of CuCr 0.9 Mg 0.1 O 2 compared to those of the NiO reference, respectively, which leads to a higher hole collection efficiency.