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Intensity Dependent Femtosecond Dynamics in a PBDTTPD-Based Solar Cell Material

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Inorganic and Hybrid Interfacial Materials for Organic and Perovskite Solar Cells

Mohammad Khaja Nazeeruddin

As organic solar cells (OSCs) and perovskite solar cells (PVSCs) move closer to commercialization, further efforts toward optimizing both cell efficiency and stability are needed. As interfaces strongly affect device performance and degradation processes, ...

2020

Optoelectronic Properties of Layered Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Yonghui Lee, Kyung Taek Cho

Herein, the optoelectronic properties of interface-engineered perovskite 2D|3D-heterojunction structure solar cells are reported. The reciprocity theorem is applied to determine the maximum open-circuit voltage (V-oc) the device can deliver under solar ill ...

2019

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We applied hydrogen passivation, gettering and a combination of both to quasi-mono (qm) wafer material to enhance its bulk lifetime and prepared silicon heterojunction (SHJ) solar cells. We find that while our applied hydrogen passivation alone seems not t ...

IEEE2018

Silicon Heterojunction Solar Cells on Quasi-mono Wafers

Christophe Ballif, Antoine Descoeudres, Matthieu Despeisse, Mathieu Gérard Boccard, Loris Barraud, Jan Haschke, Raphaël Monnard, Brahim Aissa

IEEE2018

Solution-processable semiconducting polymers have been explored over the last decades for their potential applications in inexpensively fabricated transistors, diodes and photovoltaic cells. However, a remaining challenge in the field is to control the sol ...

Schweizerische Chemische Gesellschaft2017

The fate of charge carriers in solar materials investigated by time resolved X-ray and optical spectroscopy

Fabio Giacomo Santomauro

This thesis investigates the photoinduced charge carrier dynamics of TiO2 nanoparticles and CsPbX3 (X = Cl, Br) nanocrystals, by means of ultrafast x-ray absorption spectroscopy (XAS) and transient absorption spectroscopy (TAS). TiO2 is among the most prom ...

EPFL2017

Cobalt and/or copper complexes for use as hole transport layer dopants to improve optoelectronic or photoelectrochemical devices

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Fabrizio Giordano, Ulf Anders Hagfeldt, Marina Freitag, Julian Burschka

This invention discloses a new class of dopants that allows easy tuning of the chem., phys., optical and/or electronic properties of the doping agent in order to carefully adapt it to the desired application, such as org. solar cells or solid state dye-sen ...

U.S. Pat. Appl. Publ. (2016),2016

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We have used a femtosecond-resolved spectroscopic technique based on the Stark effect (electromodulated differential absorption) in order to investigate free charge generation and charge drift in solar cell devices of neat conjugated polymer pBTTT and in i ...

Spie-Int Soc Optical Engineering2015

Due to advantages such as mechanical flexibility, light weight and the prospect to use low-cost roll-to-roll manufacturing processes, organic semiconductors have been widely investi-gated in many application areas as alternatives for their inorganic counte ...

EPFL2015

Charge generation in organic solar cell materials studied by terahertz spectroscopy

Natalie Renuka Banerji, Jan Cornelius Brauer, Mariateresa Scarongella

We have investigated the photophysics in neat films of conjugated polymer PBDTTPD and its blend with PCBM using terahertz time-domain spectroscopy. This material has very high efficiency when used in organic solar cells. We were able to identify a THz sign ...

Spie-Int Soc Optical Engineering2015