Publication

Dopant-free star-shaped hole-transport materials for efficient and stable perovskite solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Chenyi Yi, Xiong Li, Dongqin Bi, Fei Zhang, Shilong Wang
2017
Journal Articles

Abstract

Two star-shaped TPA-based small-molecule materials (Z1012 and Z1013) were designed and synthesized in this paper. These molecules show high hole mobility and suitable energy levels for CH3NH3PbI3-based perovskite solar cells. Photovoltaic cells based on the Z1013 without any dopants or additives achieve an excellent power conversion efficiency (PCE) of 15.4%, which is comparable to devices based on state-of art p-doped spiro-OMeTAD. Moreover, the devices based on these two HTM5 show much better stability than that of devices based on spiro-OMeTAD when aging in ambient air both at room temperature and 80 degrees C. These results demonstrate that star-shape TPA5 could be excellent dopant-free HTM5 for perovskite solar cells and hold promise to replace the p-doped spiro-OMeTAD, which is important for the fabrication of cost-effective and stable devices. (C) 2016 Published by Elsevier Ltd.

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https://infoscience.epfl.ch/entities/publication/485e0ec8-8c95-4ab2-ad5d-4abbdcf03ac7

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Michael Graetzel, Shaik Mohammed Zakeeruddin, Chenyi Yi, Xiong Li, Dongqin Bi, Fei Zhang, Shilong Wang
2017
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/485e0ec8-8c95-4ab2-ad5d-4abbdcf03ac7

About this result

Related concepts (18)

Perovskite solar cell

A perovskite solar cell (PSC) is a type of solar cell that includes a perovskite-structured compound, most commonly a hybrid organic–inorganic lead or tin halide-based material as the light-harvesting active layer. Perovskite materials, such as methylammonium lead halides and all-inorganic cesium lead halide, are cheap to produce and simple to manufacture. Solar-cell efficiencies of laboratory-scale devices using these materials have increased from 3.8% in 2009 to 25.

Solar cell

A solar cell, or photovoltaic cell, is an electronic device that converts the energy of light directly into electricity by the photovoltaic effect, which is a physical phenomenon. It is a form of photoelectric cell, defined as a device whose electrical characteristics, such as current, voltage, or resistance, vary when exposed to light. Individual solar cell devices are often the electrical building blocks of photovoltaic modules, known colloquially as solar panels.

Thin-film solar cell

Thin-film solar cells are made by depositing one or more thin layers (thin films or TFs) of photovoltaic material onto a substrate, such as glass, plastic or metal. Thin-film solar cells are typically a few nanometers (nm) to a few microns (μm) thick–much thinner than the wafers used in conventional crystalline silicon (c-Si) based solar cells, which can be up to 200 μm thick. Thin-film solar cells are commercially used in several technologies, including cadmium telluride (CdTe), copper indium gallium diselenide (CIGS), and amorphous thin-film silicon (a-Si, TF-Si).

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