Publications associées à Branched Fluorenylidene Derivatives with Low Ionization Potentials as Hole-Transporting Materials for Perovskite Solar Cells

Publications associées (21)

Perovskite heteroepitaxy for high-efficiency and stable pure-red LEDs

Ultrasmall CsPbI3 perovskite quantum dots (QDs) are the most promising candidates for realizing efficient and stable pure-red perovskite light-emitting diodes (PeLEDs)1, 2, 3, 4–5. However, it is challenging for ultrasmall CsPbI3 QDs to retain their soluti ...

2025

Active Passivation Charge Transport in n‐i‐p Perovskite Solar Cells Approaching 26% Efficiency

Mohammad Khaja Nazeeruddin

In n‐i‐p planar perovskite solar cells (PSCs), the electron transport layer (ETL) and the hole transporting layer play a crucial role in realizing high power conversion efficiency (PCE). Herein, a TiO2‐SDBA‐SnO2 stacked ETL is reported, where 4,4′‐sulfonyl ...

Wiley2025

Strain-induced rubidium incorporation into wide-bandgap perovskites reduces photovoltage loss

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mounir Driss Mensi, Ursula Röthlisberger, David Lyndon Emsley, Pascal Alexander Schouwink, Jing Gao, Felix Thomas Eickemeyer, Michael Allan Hope, Lukas Pfeifer, Nikolaos Lempesis, Virginia Carnevali, Ümmügülsüm Günes, Lorenzo Agosta, Yuxuan Zhang, Likai Zheng, Vladislav Slama, Francesco Biasoni

A-site cation mixing can enhance the photovoltaic performance of a wide-bandgap (WBG) perovskite, but rubidium (Rb) cation mixing generally forms a nonperovskite phase. We report that lattice strain locks Rb ions into the α-phase of the lattice of a triple ...

American Association for the Advancement of Science (AAAS)2025

Data-driven design of organic electronic materials

Jacob Terence Blaskovits

Singlet fission (SF) is a multiexciton-generating process whereby an excited state singlet (S1) is converted into two lower-energy triplets (T1). The inclusion of a SF-capable material into a photovoltaic device offers the potential for the absorption of p ...

EPFL2023

Pre-annealing for improved LPCVD deposited boron-doped poly-Si hole-selective contacts

Xinyu Zhang, Franz-Josef Haug, Luca Massimiliano Antognini, Josua Andreas Stückelberger

We demonstrate the beneficial effect of a pre-annealing step prior to the boron diffusion on passivation and contact resistivity of industrially LPCVD deposited poly-Si/SiOX hole-selective contacts. We investigate the influence of the pre-annealing tempera ...

ELSEVIER2023

Anion Exchange Membranes for Hydrogen Technologies: Challenges and Progress

Xile Hu, Xingyu Wu

Anion exchange membrane fuel cells (AEMFCs) are considered one of the most promising and efficient hydrogen conversion technologies due to their ability to use cost-effective materials. However, AEMFCs are still in an early stage of development and the lac ...

SWISS CHEMICAL SOC2023

Heteroatom oxidation controls singlet-triplet energy splitting in singlet fission building blocks

Anne-Clémence Corminboeuf, Sergio Vela Llausi, Jacob Terence Blaskovits, Maria Fumanal Quintana, Yuri Cho

Singlet fission (SF) is a promising multiexciton-generating process. Its demanding energy splitting criterion - that the S-1 energy must be at least twice that of T-1 - has limited the range of materials capable of SF. We propose heteroatom oxidation as a ...

Royal Society of Chemistry2022

Traps for Electrons and Holes Limit the Efficiency and Durability of Polymer Light-Emitting Electrochemical Cells

Frank Nüesch, Wei-Hsu Hu, Camilla Arietta Vael-Garn

Polymer light-emitting electrochemical cells (PLECs) and light-emitting diodes (PLEDs) receive interest for large-area lighting and signage applications. During operation of a PLEC, a p-i-n junction develops where electrons and holes are injected into the ...

2022

Device Performance of Emerging Photovoltaic Materials (Version 2)

Mohammad Khaja Nazeeruddin

Following the 1st release of the "Emerging photovoltaic (PV) reports", the best achievements in the performance of emerging photovoltaic devices in diverse emerging photovoltaic research subjects are summarized, as reported in peer-reviewed articles in aca ...

WILEY-V C H VERLAG GMBH2021

Cut from the Same Cloth: Enamine-Derived Spirobifluorenes as Hole Transporters for Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Paul Joseph Dyson, Kasparas Rakstys, Cansu Igci, Albertus Adrian Sutanto, Maria Cristina Momblona Rincón, Bin Ding

To attain commercial viability, perovskite solar cells (PSCs) have to be reasonably priced, highly efficient, and stable for a long period of time. Although a new record of a certified power conversion efficiency (PCE) value over 25% was achieved, PSC perf ...

AMER CHEMICAL SOC2021

Optical and structure properties of CH3NH3PbI3 perovskite films doped with Cesium

Anwar Qasem M Alanazi

Methylammonium lead iodide doped with cesium (MA(1-x)Cs(x)PbI(3), x = 0, 0.03, 0.05, 0.1) thin films were prepared with and without chlorobenzene (CB). X-ray diffraction analysis applying the Rietveld refinement method is carried out, and the effect of Cs ...

EDP Sciences2021

Solution-based heteroepitaxial growth of stable mixed cation/anion hybrid perovskite thin film under ambient condition via a scalable crystal engineering approach

Michael Graetzel, Shaik Mohammed Zakeeruddin, Fabrizio Giordano

The performance of perovskite solar cells is under direct control of the perovskite film quality and controlling the crystalinity and orientation of solution-processed perovskite film is a fundamental challenge. In this study, we present a scalable fabrica ...

Elsevier2020

Design of Optimized PEDOT‐Based Electrodes for Enhancing Performance of Living Photovoltaics Based on Phototropic Bacteria

Ardemis Anoush Boghossian, Alessandra Antonucci, Melania Reggente

Living photovoltaics represent a growing class of microbial devices that are based on whole cell–electrode interactions. The limited charge transfer at the cell–electrode interface represents a significant bottleneck in realizing an efficient technology. T ...

Wiley2020

Copper Bipyridyl Redox Mediators for High Performance Dye-Sensitized Solar Cells

Yasemin Saygili

Photovoltaic (PV) technologies attract a lot of attention as a result of the increasing energy demand and environmental concerns stemming from the conventional energy resources. Accordingly, the power conversion efficiency (PCE) values of various solar ene ...

EPFL2019

Electroluminescence Dynamics in Perovskite Solar Cells Reveals Giant Overshoot Effect

Wolfgang Richard Tress, Marius Franckevicius

High performance of both photovoltaic and electroluminescent devices requires low nonradiative recombination losses. In perovskites, such loses strongly depend on the carrier traps related to the mobile ions and vacancies, causing I-V hysteresis of solar c ...

AMER CHEMICAL SOC2019

Extraction of p-n junction properties and series resistance in GaAs nanowire-based solar cells using light concentration

Anna Fontcuberta i Morral, Dmitry Mikulik, Pablo Romero Gómez

Series resistance in solar cells limit their maximum conversion efficiency and thus should be minimized. Generally, such losses originate from deficiencies at the contact or absorber level. Quantifying them is the first step for tackling its reduction. In ...

IOP PUBLISHING LTD2019

Evidence for a dual mechanism in the TiO2/CuxO photocatalyst during the degradation of sulfamethazine under solar or visible light: Critical issues

Juan Kiwi, César Pulgarin, Sami Rtimi

This study presents the photocatalytic degradation of sulfamethazine (SMT) on TiO2/CuxO nanotubes (NTs) by a differentiated mechanism under low intensity solar light and indoor visible light irradiation. In the presence of TiO2/CuxO nanotubes, the SMT-degr ...

ELSEVIER SCIENCE SA2019

Additives, Hole Transporting Materials and Spectroscopic Methods to Characterize the Properties of Perovskite Films

Michael Graetzel, Shaik Mohammed Zakeeruddin, Nikolaos Vlachopoulos, Ulf Anders Hagfeldt, Marko Stojanovic, Amita Ummadisingu, Jiyoun Seo, Michael Saliba

The achievement of high efficiency and high stability in perovskite solar cells (PSCs) requires optimal selection and evaluation of the various components. After a brief introduction to the perovskite materials and their historical evolution, the first par ...

Schweizerische Chemische Gesellschaft2017

Spontaneous crystal coalescence enables highly efficient perovskite solar cells

Michael Graetzel, Ulf Anders Hagfeldt, Amita Ummadisingu, Juan-Pablo Correa-Baena, Antonio Abate, Michael Saliba

Perovskite solar cells have recently reached staggering efficiencies, through efforts focused on reducing grain boundaries, by enlarging the size of the crystalline domains that constitute the perovskite films. Here, we demonstrate that smaller crystallite ...

Elsevier Science Bv2017

Charge Transport in Organic Nanofibrils: Lessons from Modelling

Anne-Clémence Corminboeuf, Pauline Jeanne Ollitrault, Antonio Prlj, Ganna Gryn'ova, Adrien Georges Nicolai

H-aggregates featuring tight π-stacks of the conjugated heterocyclic cores represent ideal morphologies for 1D organic semiconductors. Such nanofibrils have larger electronic couplings between the adjacent cores compared to the herringbone crystal or amorp ...

Royal Society of Chemistry2017