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A sequential condensation route as a versatile platform for low cost and efficient hole transport materials in perovskite solar cells

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Organic-inorganic lead halide perovskite absorbers in combination with electron and hole transporting selective contacts result in power conversion efficiencies of over 23% under AM 1.5 sun conditions. The advantage of perovskite solar cells is their simpl ...

2019

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Hole transport matertial (HTM) as charge selective layer in perovskite solar cells (PSCs) plays an important role in achieving high power conversion efficiency (PCE). It is known that the dopants and additives are necessary in the HTM in order to improve t ...

Wiley-V C H Verlag Gmbh2017

A novel perovskite solar cell design using aligned TiO2 nano-bundles grown on a sputtered Ti layer and a benzothiadiazole-based, dopant-free hole-transporting material

Mohammad Khaja Nazeeruddin

This work highlights the utilization of a novel hole-transporting material (HTM) derived from benzothiadiazole: 4-(3,5-bis(trifluoromethyl) phenyl)-7-(5'-hexyl-[2,2'-bithiophen]-5-yl) benzo[c][1,2,5] thiadiazole (CF-BTz-ThR) and aligned TiO2 nano-bundles ( ...

Royal Society of Chemistry2017

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Through judicious molecular engineering, novel dopant-free star-shaped D-pi-A type hole transporting materials coded KR355, KR321, and KR353 were systematically designed, synthesized and characterized. KR321 has been revealed to form a particular face-on o ...

Royal Society of Chemistry2017

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The synthesis and characterization of a series of novel small-molecule holetransporting materials (HTMs) based on an anthra [1,2-b: 4,3-b': 5,6-b '': 8,7-b '''] tetrathiophene (ATT) core are reported. The new compounds follow an easy synthetic route and ha ...

Wiley-V C H Verlag Gmbh2017

Migration of cations induces reversible performance losses over day/night cycling in perovskite solar cells

Mohammad Khaja Nazeeruddin, Wolfgang Richard Tress, Ulf Anders Hagfeldt, Michael Saliba, Filippo de Angelis, Antonio Abate, Juan-Pablo Correa-Baena, Konrad Domanski, Silver Hamill Turren Cruz, Taisuke Matsui

Perovskites have been demonstrated in solar cells with a power conversion efficiency of well above 20%, which makes them one of the strongest contenders for next generation photovoltaics. While there are no concerns about their efficiency, very little is ...

Royal Soc Chemistry2017

In this work, we analyze the carrier recombination kinetics and the associated charge carrier density in methylammonium lead iodide perovskite (MAPI) solar cells that use mesoporous TiO2, as selective contact (m-MAPI) and flat solar cells (without the meso ...

Amer Chemical Soc2017

A Strategy to Produce High Efficiency, High Stability Perovskite Solar Cells Using Functionalized Ionic Liquid-Dopants

Mohammad Khaja Nazeeruddin, Yi Zhang, Paul Joseph Dyson, Rosario Scopelliti, Zhaofu Fei, Farzaneh Fadaei Tirani, Peng Gao, Yonghui Lee

Functionalized imidazolium iodide salts (ionic liquids) modified with -CH2-CH=CH2, -CH2C equivalent to CH, or -CH2C equivalent to N groups are applied as dopants in the synthesis of CH3NH3PbI3-type perovskites together with a fumigation step. Notably, a so ...

Wiley-Blackwell2017

Hole-Transport Materials for Perovskite Solar Cells

Michael Graetzel, Laura Calio

The pressure to move towards renewable energy has inspired researchers to look for ideas in photovoltaics that may lead to a major breakthrough. Recently the use of perovskites as a light harvester has lead to stunning progress. The power conversion effici ...

Wiley-Blackwell2016

Perovskite Solar Cells Employing Molecularly Engineered Zn(II) Phthalocyanines as Hole-transporting Materials

Mohammad Khaja Nazeeruddin, Kyung Taek Cho, Kasparas Rakstys

Amino donor groups-substituted zinc(II) phthalocyanines (ZnPcs) BI25, BL07 and BL08 were obtained via cyclotetramerization of suitable phthalonitriles that were synthesized by Pd catalyzed amination reaction between 4-iodophthalonitrile and a selected seco ...

Elsevier Science Bv2016