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Peng Gao

Cette personne n’est plus à l’EPFL

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Publications associées (76)

Hole transport layer material and solar cell using hole transport layer material having high photoelectric conversion efficiency

Michael Graetzel, Mohammad Khaja Nazeeruddin, Peng Gao, Paramaguru Ganesan

2016

A dopant free linear acene derivative as a hole transport material for perovskite pigmented solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Peng Gao, Francisco Javier Ramos Mellado

A solution processable, molecular organic semiconductor, 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene), was employed as hole transport material (HTM) in mesoscopic methylammonium lead iodide perovskite solar cells. TIPS-pentacene is potenti ...

Royal Soc Chemistry2015

Molecular Engineering of Functional Materials for Energy and Opto-Electronic Applications

Mohammad Khaja Nazeeruddin, Peng Gao, Sadig Aghazada

This review presents an overview of the dedicated research directions of the Group for Molecular Engineering of Functional Materials (GMF). This includes molecular engineering aspects of sensitizers constructed from ruthenium complexes, organic molecules, ...

Swiss Chemical Soc2015

Nanowire Perovskite Solar Cell

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Norman Pellet, Thomas Moehl, Peng Gao, Jingshan Luo, Jeong-Hyeok Im, Marius Franckevicius

Organolead iodide perovskite, CH3NH3PbI3, was prepared in the form of nanowire by means of a small quantity of aprotic solvent in two-step spin-coating procedure. One-dimensional nanowire perovskite with the mean diameter of 100 nm showed faster carrier se ...

American Chemical Society2015

Unravel the Impact of Anchoring Groups on the Photovoltaic Performances of Diketopyrrolopyrrole Sensitizers for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aswani Yella, Peng Gao, Thomas Wesley Holcombe, Paramaguru Ganesan

Two D-pi-A dyes, one with a strong electron withdrawing cyanoacrylic acid DPP 20 and one with a weak acceptor carboxylic acid DPP 21 have been synthesized and characterized for their application in dye-sensitized solar cells. This allows us to understand t ...

Amer Chemical Soc2015

Unraveling the Reasons for Efficiency Loss in Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Peng Gao, Yonghui Lee, Jingshan Luo

The effect of the presence of unreacted PbI2 on the perovskite solar cells efficiency is reported. N,N-Dimethylformamide vapor treatment is introduced to study the influence of complete conversion to a power conversion efficiency of the device. It is disco ...

Wiley-Blackwell2015

Double D-pi-A Dye Linked by 2,2'-Bipyridine Dicarboxylic Acid: Influence of para- and meta-Substituted Carboxyl Anchoring Group

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Peng Gao, Paramaguru Ganesan

Starting from 2,2-bipyridine dicarboxylic acid, two new (D--A)(2) sensitizers, including m-DA with the carboxyl anchoring group substituted meta to the donor-bridge moiety and p-DA with a para-substituted anchoring group, were synthesized in order to evalu ...

Wiley-Blackwell2015

A simple spiro-type hole transporting material for efficient perovskite solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti, Kurt Schenk, Ines Raabe, Peng Gao, Paramaguru Ganesan, Jingshan Luo, Kunwu Fu

We developed a cost-effective spiro-type 4,4 ',4 '',4 '''-(2H,2 ' H,4H,4 ' H-3,3 '-spiro-bi[thieno[3,4-b][1,4] dioxepine]-6,6 ',8,8 '-tetrayl) tetrakis(N,N-bis(4-methoxyphenyl)aniline) hole transporting material (PST1) for perovskite solar cells (PSCs) th ...

Royal Society of Chemistry2015

Silolothiophene-linked triphenylamines as stable hole transporting materials for high efficiency perovskite solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Ulf Anders Hagfeldt, Peng Gao, Fabrizio Giordano, Sanghyun Paek, Juan-Pablo Correa-Baena, Antonio Abate, Taisuke Matsui, Michael Saliba

In this work, we synthesized novel hole transporting materials (HTMs) and studied their impact on the stability of perovskite-based solar cells (PSCs). The steady-state maximum power output of devices in working condition was monitored to assess the stabil ...

Royal Society of Chemistry2015

Triazatruxene-Based Hole Transporting Materials for Highly Efficient Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Peng Gao, Kasparas Rakstys, Gwénolé Jean Jacopin, Mohammad Ibrahim Dar, Antonio Abate

Four center symmetrical star-shaped hole transporting materials (HTMs) comprising planar triazatruxene core and electron-rich methoxy-engineered side arms have been synthesized and successfully employed in (FAPbI(3))(0.85)(MAPbBr(3))(0.15) perovskite solar ...

Amer Chemical Soc2015

A Novel Oligomer as a Hole Transporting Material for Efficient Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Nicolas Tétreault, Peng Gao, Peng Qin, Mohammad Ibrahim Dar

(Figure Presented) A polytriarylamine-based oligomer is reported as a hole transporting material and its application in solid-state CH3NH3PbI3 based heterojunction solar cells is described. It yields a power conversion efficiency of 12.0% under 99.6 mW cm- ...

Wiley-VCH Verlag Berlin2015

Stable and Efficient Perovskite Solar Cells Based on Titania Nanotube Arrays

Michael Graetzel, Mohammad Khaja Nazeeruddin, Thomas Moehl, Peng Gao, Peng Qin, Mohammad Ibrahim Dar, Neha Arora

Highly ordered 1D TiO2 nanotube arrays are fabricated and applied as nanocontainers and electron transporting material in CH3NH3PbI3 perovskite solar cells. The optimized device shows a power conversion efficiency of 14.8%, and improved stability under an ...

Wiley-V C H Verlag Gmbh2015

Efficient and selective carbon dioxide reduction on low cost protected Cu2O photocathodes using a molecular catalyst

Michael Graetzel, Mohammad Khaja Nazeeruddin, Marcel Roland Schreier, Thomas Moehl, Stanley David Tilley, Peng Gao, Matthew Thomas Mayer, Jingshan Luo

Photoelectrochemical reduction of CO2 to CO was driven by a TiO2-protected Cu2O photocathode paired with a rhenium bipyridyl catalyst. Efficient and selective CO evolution was shown to be stable over several hours. The use of protic solution additives to o ...

Royal Soc Chemistry2015

High efficiency methylammonium lead triiodide perovskite solar cells: the relevance of non-stoichiometric precursors

Michael Graetzel, Mohammad Khaja Nazeeruddin, Paul Gratia, Peng Gao, Cristina Roldán Carmona, Iwan Zimmermann, Giulia Grancini

Methylammonium lead iodide perovskite solar cells with improved performance and stability have been successfully prepared by using a non-stoichiometric PbI2 : CH3NH3I ratio in the precursor solution, and yield a power conversion efficiency (PCE) of above 1 ...

Royal Soc Chemistry2015

Investigation Regarding the Role of Chloride in Organic-Inorganic Halide Perovskites Obtained from Chloride Containing Precursors

Michael Graetzel, Mohammad Khaja Nazeeruddin, Peng Gao, Mohammad Ibrahim Dar, Neha Arora

As the photovoltaic performance of a device is strongly influenced by the morphology of perovskite, achieving precise control over the crystal formation of organic-inorganic halide perovskites synthesized in the ambience of chloride ions has garnered much ...

American Chemical Society2014

Dye-sensitized solar cells with 13% efficiency achieved through the molecular engineering of porphyrin sensitizers

Michael Graetzel, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Ursula Röthlisberger, Ivano Tavernelli, Basile Curchod, Negar Ashari Astani, Aswani Yella, Peng Gao, Simon Mathew

Dye-sensitized solar cells have gained widespread attention in recent years because of their low production costs, ease of fabrication and tunable optical properties, such as colour and transparency. Here, we report a molecularly engineered porphyrin dye, ...

2014

Molecular Engineering of 2-Quinolinone Based Anchoring Groups for Dye-Sensitized Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Aravind Kumar Chandiran, Peng Gao, Paramaguru Ganesan

Six new donor-pi spacer-acceptor (D-pi-A) organic sensitizers based on the 2-quinolinone moiety as acceptor and anchoring groups were synthesized and tested for their performance in dye-sensitized solar cells (DSSCs). The systematic tuning of acceptor stre ...

American Chemical Society2014

Thermal Behavior of Methylammonium Lead-Trihalide Perovskite Photovoltaic Light Harvesters

Michael Graetzel, Mohammad Khaja Nazeeruddin, Amalie Dualeh, Peng Gao

Recently organicinorganic hybrid perovskites have attracted attention as light harvesting materials in mesoscopic cells. While a considerable number of deposition and formation methods have been reported for the perovskite crystalline material, most involv ...

Amer Chemical Soc2014

Impedance Spectroscopic Analysis of Lead Iodide Perovskite-Sensitized Solid-State Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Joël Teuscher, Nicolas Tétreault, Thomas Moehl, Amalie Dualeh, Peng Gao

Mesoscopic solid-state solar cells based on the inorganic-organic hybrid perovskite CH(3)NH(3)Pbl(3) in conjunction with the amorphous organic semiconductor spiro-MeOTAD as a hole transport material (HIM) are investigated using impedance spectroscopy (IS). ...

American Chemical Society2014

Yttrium-substituted nanocrystalline TiO2 photoanodes for perovskite based heterojunction solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Nicolas Tétreault, Aravind Kumar Chandiran, Thomas Moehl, Peng Gao, Peng Qin, Mohammad Ibrahim Dar

We report the use of Y3+-substituted TiO2 (0.5% Y-TiO2) in solid-state mesoscopic solar cells, consisting of CH3NH3PbI3 as the light harvester and spiro-OMeTAD as the hole transport material. A power conversion efficiency of 11.2% under simulated AM 1.5 fu ...

Royal Society of Chemistry2014

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