PT Journal
AU Wahyuono, R
   Schmidt, C
   Dellith, A
   Dellith, J
   Schulz, M
   Seyring, M
   Rettenmayr, M
   Plentz, J
   Dietzek, B
TI ZnO nanoflowers-based photoanodes: aqueous chemical synthesis, microstructure and optical properties
SO Open Chemistry: formerly Central European journal of chemistry
PD January
PY 2016
BP 158
EP 169
VL 14, 2016
IS 1
PU de Gruyter
DI 10.1515/chem-2016-0016
WP https://www.db-thueringen.de/receive/dbt_mods_00064877
LA en
DE ZnO nanoflowers; Microstructures; Bandgap; Light harvesting; Dye-sensitized solar cell
SN 2391-5420
AB We have developed an efficient, low temperature, synthetic route for ZnO nanoflowers (NFs) as photoanode material. This alternative route yields small flowerlike nanostructures, built from densely self-assembled tip-ended rod structures. The obtained ZnO NFs possess a large bandgap of 3.27 - 3.39 eV, enabling the generation of an average open current voltage of 0.56 V. Additionally, they show a high internal light harvesting of 14.6•10 -7 A-mol -1 . The growth mechanism and self-assembly of ZnO NFs were studied in detail by joint spectroscopic-TEM investigations. It is shown that the ZnO crystallite size increases with increasing annealing temperatures and that the stress and the improved crystallinity are induced by annealing and reduce the lattice strain and the dislocation density. The bandgaps of ZnO are affected by the lattice strain revealing an optimal region of lattice strain to gain high bandgap energies. The properties of the synthesized ZnO NFs are compared with other morphologies, i.e . ZnO spherical aggregates (SPs) and ZnO nanorods (NRs), and are tested as electrode materials in dye-sensitized solar cells.
PI Berlin
ER