Enhanced efficiency of quantum dot sensitized solar cells using Cu2O/TiO2 nanocomposite photoanodes

摘要: Abstract Several quantum dot sensitized solar cells (QDSSCs) were fabricated by doping Cu2O nanoparticles (NPs) into the TiO2 photoanode pastes in order to improve their efficiencies. The QDSSCs made using CuS counter electrode and sulfide/polysulfide electrolyte. inclusion of NPs photoanodes both CdS CdSe was found increase photocurrent efficiency. XPS analysis approved that particles successfully impregnated on NPs. Results indicated photovoltaic parameters optimized cell (η = 3.01%, JSC = 10.2 mA cm−2, VOC = 0.59 V, FF = 0.50) boosted compared with those reference which free (η = 1.88%, JSC = 7.0 mA cm−2, VOC = 0.56 V, FF = 0.48) signifying about 60, 46 5% improvements efficiency, current density open-circuit voltage, respectively. lowest intensity photoluminescence (PL) peak for 0.03% doped suggested it had least charge recombination easiest electron transfer confirmed J-V efficiency data. electrochemical impedance spectra (EIS) proved life time considerably improved approximately ten times (τe = 60.0 ms) only (τe = 5.8 ms). Thus, addition 0.03%wt as a dopant very appropriate attain suitable because could be used minimum amount transport, drop