Quantum dot PbS0. 9Se0. 1/TiO2 heterojunction solar cells- September 2012
G Zhai, CP Church, AJ Breeze, D Zhang, GB Alers, and SA Carter – Nanotechnology Vol 23 (Num 40), 2012
We report on photovoltaic cells based on ternary PbS0.9Se0.1 quantum dots utilizing a heterojunction type device configuration. The best device shows an AM 1.5 power conversion efficiency of 4.25%. Furthermore, this ternary PbSxSe1−x quantum dot heterojunction device has a peak external quantum efficiency above 100% at 2.76 eV, approximately 2.7 × the bandgap energy. The ternary quantum dots combine the higher short circuit currents of the binary PbSe system with the higher open circuit voltages of the binary PbS system… A Shimadzu UV-3101PC UV–vis–NIR spectrometer was used to measure the absorption spectra of ternary PbS x Se 1−x QD solution. Optical properties of ternary QD films were measured via a StellarNet TF-C-UVIS-SRN dual spectrometer.
