Publications by Year: 2013

Waleed Abu Laban and Etgar Lioz. 9/2013. “Depleted hole conductor-free lead halide iodideheterojunction solar cells.” Energy Environ. Sci., 2013, 6: 3249–3253.Abstract

Lead halide perovskite is an excellent candidate for use as a light harvester in solar cells. Our work presents a depleted hole conductor free CH3NH3PbI3/TiO2 heterojunction solar cell using a thick CH3NH3PbI3 film. The CH3NH3PbI3 formed large crystals which function
simultaneously as light harvesters and as hole transportmaterials. We performed capacitance voltage measurements, which show a depletion regionwhich extends to both n and p sides. The built-in field of the depletion region assists in the charge separation and suppresses the back reaction of electrons from the TiO2 film to the CH3NH3PbI3 film. This depleted hole conductor free CH3NH3PbI3/TiO2 heterojunction solar cell provides a power conversion efficiency of 8% with a current density of 18.8 mA cm2, the highest efficiency achieved to date for perovskite based solar cells without a hole conductor.

Etgar Lioz, Guillaume Schuchardt, Daniele Costenaro, Fabio Carniato, Chiara Bisio, Shaik M. Zakeeruddin, Mohammad K. Nazeeruddin, Leonardo Marchese, and Michael Graetzel. 6/2013. “Enhancing the open circuit voltage of dye sensitizedsolar cells by surface engineering of silica particles in agel electrolyte.” J. Mater. Chem. A, 2013, 1: 10142–10147.Abstract

We prepared a quasi-solid electrolyte for dye-sensitized solar cells (DSSCs) that consist of ionic liquid and modified silica particles. Commercial bare silica F5 particles and modified silica F5 by NH2 and NH3groups were prepared, and fully characterized. The best photovoltaic performance was observed using the NH2 modified silica particles giving an open circuit voltage (Voc) of 815 mV, a short-circuit current (Jsc) of 11.23 mA cm-2, and a fill factor (FF) of 0.75 corresponding to an overall power conversion efficiency of 7.04% at 100 mW cm-2 AM 1.5. The modification of the silica particles by NH2 groups increases the Voc of DSSCs by around 60 mV compared to pure ionic liquid electrolyte based DSSCs.

Etgar Lioz. 2/2013. “Semiconductor Nanocrystals as Light Harvesters in Solar Cells.” Materials, 2013, 6: 445-459.Abstract

Photovoltaic cells use semiconductors to convert sunlight into electrical current
and are regarded as a key technology for a sustainable energy supply. Quantum dot-based
solar cells have shown great potential as next generation, high performance, low-cost
photovoltaics due to the outstanding optoelectronic properties of quantum dots and their
multiple exciton generation (MEG) capability. This review focuses on QDs as light
harvesters in solar cells, including different structures of QD-based solar cells, such as QD
heterojunction solar cells, QD-Schottky solar cells, QD-sensitized solar cells and the recent
development in organic-inorganic perovskite heterojunction solar cells. Mechanisms,
procedures, advantages, disadvantages and the latest results obtained in the field are
described. To summarize, a future perspective is offered.

Etgar Lioz, Diana Yanover, Richard Karel Cˇapek, Roman Vaxenburg, Zhaosheng Xue, Bin Liu, Mohammad Khaja Nazeeruddin, Efrat Lifshitz, and Michael Grätzel. 1/2013. “Core/Shell PbSe/PbS QDs TiO2 Heterojunction Solar Cell.” Adv. Funct. Mater., 2013, 23: 2736–2741. coreshell_pbsepbs_qds_tio2_heterojunction_solar_cell.pdf
Takafumi Fukumoto, Thomas Moehl, Yusuke Niwa, Md. K. Nazeeruddin, Michael Grätzel, and Etgar Lioz. 2013. “Effect of Interfacial Engineering in Solid-State Nanostructured Sb2S3 Heterojunction Solar Cells.” Adv. Energy Mater, 2013, 3: 29–33. effect_of_interfacial_engineering_in_solid-state_nanostructured_sb2s3_heterojunction_solar_cells.pdf
Etgar Lioz, HyoJoong Lee, Md K. Nazeeruddin, and Grätzel Michael. 2013. “Semiconductor quantum dot sensitized TiO2 mesoporous solar cells.” In Colloidal Quantum Dot Optoelectronics and Photovoltaics, 292-309. Cambridge University Press.
Etgar Lioz. 2013. “Thin Film Solar Cells based on Quantum Dots.” In Light Energy Conversion . Wiley-Inter science Series on Nanotechnology.