Cellule photovoltaïque à pérovskite

Une cellule photovoltaïque à pérovskite est un type de cellule photovoltaïque dont la couche active est constituée d'un matériau de formule générale à structure pérovskite dans laquelle A est un cation, généralement de méthylammonium (MA), de formamidinium ou de césium , B est un cation d'étain ou de plomb , et X est un anion halogénure tel que chlorure , bromure ou iodure . Le rendement des cellules photovoltaïques utilisant ces matériaux est en constante augmentation depuis la fin des années 2000. Elle est passée de en 2009 à en 2019, et pour le tandem de pérovskite et de silicium, soit une efficacité supérieure aux cellules photovoltaïques à jonction p-n en silicium. Les cellules à pérovskites sont donc à ce jour la technologie solaire ayant connu le développement le plus rapide de l'histoire. Néanmoins, ces cellules souffrent de problèmes de vieillissement et de stabilité structurale à l'échelle du module. Cependant avec un

À propos de ce résultat

Cette page est générée automatiquement et peut contenir des informations qui ne sont pas correctes, complètes, à jour ou pertinentes par rapport à votre recherche. Il en va de même pour toutes les autres pages de ce site. Veillez à vérifier les informations auprès des sources officielles de l'EPFL.

Publications associées (100)

Publications associées

Chargement

Personnes associées (289)

Personnes associées

Chargement

Unités associées (41)

Unités associées

Chargement

Concepts associés (18)

Concepts associés

Chargement

Cours associés (21)

Cours associés

Chargement

Séances de cours associées (49)

Séances de cours associées

Chargement

Cooperative effects of Dopant-Free Hole-Transporting materials and polycarbonate film for sustainable perovskite solar cells

Jianxing Xia

Dopant-free hole-transporting materials (HTMs) and interface modification are two effective approaches for developing sustainable perovskite solar cells (PSCs). In this work, dopant-free HTM (GW-4) containing an N- ethyl-carbazole with two rotatable vinyl linkages is first synthesized by a green chemical method without any metal catalysts. The GW-4 cost is only 22.43% of the price of commercial 2,2'7,7'-tetrakis[N,N-di(4-methox-yphenyl)amino]-9,9 & PRIME;-spirobifluorene (spiro-OMeTAD). In the device fabrication, the concentrations of doped GW-4 (20 mg mL(-1)) and pristine GW-4 solutions (10 mg mL(-1)) are much lower than that of spiro-OMeTAD solution (doped, 72.3 mg mL-1). The power conversion efficiency (PCE) of doped GW-4-based cell is 20.45%, superior to that of spiro-OMeTAD-based cell (19.59%). As the optimal concentration of dopant-free GW-4 is insufficient to completely cover the perovskite layer, a polycarbonate (PC) polymer with carbonyl groups is first introduced to modulate perovskite grain boundaries and improve film-forming property of pristine GW-4. The cell with PC/pristine GW-4 has a slightly higher PCE (17.92%) than the cell with pristine GW-4 (17.66%). Regarding humid stability, after 455 h, the doped GW-4 and spiro-OMeTAD based PSCs retain only 11.71% and 2.27% of the initial efficiency, respectively. In striking contrast, after 850 h, the pristine GW-4 and PC/pristine GW-4 based devices retain 69.74% and 97.53% of the initial efficiency, respectively. This study provides both a new molecular design strategy to develop highly efficient dopant-free HTMs and an ingenious interfacial contrivance to overcome the defects of incomplete coverage of HTM film on perovskite layer and understand the charge dynamics at interfacial layers.

ELSEVIER SCIENCE SA2022

Chargement

Instability in CH3NH3PbI3 perovskite solar cells due to elemental migration and chemical composition changes

Zubair Ahmad

Chargement

A Porphyrin-Involved Benzene-1,3,5-Tricarboxamide Dendrimer (Por-BTA) as a Multifunctional Interface Material for Efficient and Stable Perovskite Solar Cells

Yi Zhang, Bing Zhang, Peng Zhao

Surface defects of perovskite films are the major sources of nonradiative recombination which limit the efficiency and stability of perovskite solar cells. Surface passivation represents one of the most efficient strategies to solve this problem. Herein, for the first time we designed a porphyrin-involved benzene-1,3,5-tricarboxamide dendrimer (Por-BTA) as a multifunctional interface material between the interface of the perovskite and the hole-transporting layer (spiro-OMeTAD) for the surface passivation of perovskite films. The results suggested that Por-BTA not only efficiently passivated the perovskite surface defects via the coordination of the exposed Pb2+ with the carbonyl unit and basic sites of pyrrole units in Por-BTA but also improved the interface contact and the charge transfer between the perovskite and spiro-OMeTAD ascribed to the strong intermolecular p-p stacking of Por-BTA. It was shown that the PSC devices with the Por-BTA treatment exhibited improved power conversion efficiency with the champion of 22.30% achieved (21.30% for the control devices), which is mainly attributed to the increased short-circuit current density and fill factor. Interestingly, the stability of moisture for the Por-BTA-treated device was also enhanced compared to those without the Por-BTA treatment. This work presents a promising direction toward the design of multifunctional organic molecules as the interface materials to improve the cell performance of PSCs.

AMER CHEMICAL SOC2021

Chargement

MICRO-565: Fundamentals & processes for photovoltaic devices

The objective of this lecture is to give an in-depth understanding of the physics and manufacturing processes of photovoltaic solar cells and related devices (photodetectors, photoconductors). The principle and techniques addressed in this lecture will be useful in a wide range of related fields.

MSE-484: Properties of semiconductors and related nanostructures

This course explains the origin of optical and electrical properties of semiconductors. The course elaborates how they change when the semiconductors are reduced to sizes of few nanometers. The course provides also the basis to use software to calculate the properties of hetero/nanostructures.

ChE-430: Nanomaterials for chemical engineering application

This course aims at understanding classical and non-classical nucleation theory, at reviewing different techniques for the synthesis of nanomaterials (mainly nanoparticles and thin films) and at learning about some key applications of these nanomaterials in chemical engineering

Cellule solaire à pigment photosensible

Une cellule solaire à pigment photosensible parfois appelée cellules Grätzel (en anglais, Dye-sensitized solar cell ou DSC) est un système photoélectrochimique inspiré de la photosynthèse végétale

Film photovoltaïque

Un film photovoltaïque ou cellule solaire en couche mince ou encore couche mince photovoltaïque est une technologie de cellules photovoltaïques de deuxième génération, consistant à l'incorporation d

Cellule photovoltaïque

Une cellule photovoltaïque, ou cellule solaire, est un composant électronique qui, exposé à la lumière, produit de l’électricité grâce à l’effet photovoltaïque. La puissance électrique obtenue est pro