H2020Индивидуална стипендия2019–2021

PhotSol · Towards the Photonic Solar Cell - In-Situ Defect Characterization in Metal-Halide Perovskites

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2019-07-01 → 2021-06-30
Финансиране от ЕС: 159 461 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Перовскитните слънчеви клетки се анализират, за да се разбере как електронните дефекти и примесите влияят върху тяхното напрежение. Това помага за подобряване на ефективността и дългосрочната стабилност на евтините фотоволтаици.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Towards the Photonic Solar Cell-In-Situ Defect Characterization in Metal-Halide Perovskites

The transformation of our energy economy from a fossil-fuel based system to a solar-energy based one is one of the major challenges of this century. Only such a transformation will allow for a sustainable life style and secure equal opportunities for the generations to come. One important pillar of this transformation is efficient and low-cost photovoltaics with a small ecological footprint. Recently, the pool of available technologies (mainly silicon solar cells) have been enlarged by a newcomer to the photovoltaic field: Perovskites. Solar cells based on these perovskite materials have reached similarly high efficiencies than silicon solar cells, however, so far on the lab scale only. Perovskite solar cells require little material and are simple to process. These properties make them promising contenders for the large-scale photovoltaic market. However, long-term stability issues are still a big challenge. Additionally, there is room for further efficiency improvements. This project focusses on the physics of these solar cells, and in particular on electronic defects that are a source of performance losses. Origins of these defects could be surfaces, crystal defects, grain boundaries, or impurities. The objectives of this projects are to better characterize the role of these defects on the photovoltage of the solar cell. This goal is achieved by combining numerical modelling and experimental data, for instance to better comprehend the transient photovoltage signal. To better understand the role of (unintentional and unwanted) impurities, an approach has been selected to systematically introduce a certain impurity with a controlled concentration. During this project, it has been found that certain impurities are highly relevant. Furthermore, common characterization methods have been critically evaluated. A second part of this project is dedicated to a further major drawback of the common high-efficiency perovskite solar cells: They contain the toxic element lead. This project started looking into the defect physics of alternative materials (double perovskites).

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Mitigating climate change is one of the key challenges of this century. This concerns in particular the fossil fuel-based energy sector as also stated in the H2020 topic “Secure, clean and efficient energy”. Harnessing solar energy by photovoltaics (PV) is the most promising way towards a decarbonized society. However, efficiency and costs of conventional solar cells are still hampering their broad application.Recently a novel type of solar cell appeared based on metal-halide perovskite. Due to versatile and simple manufacturing methods, its unique optoelectronic properties and high electronic quality, this material has the potential to revolutionized PV by a unique combination of low-cost and high efficiency. However, there are still loss mechanisms present that need to be understood and eliminated to make this technology really a breakthrough compared to conventional PV.This project addresses these losses, which are caused by defects (such as grain boundaries, interfaces to contact materials, and impurities) by a combination of in-depth optoelectronic and high-resolution structural characterization. The aim is to reach a completely novel operation regime, the “photonic solar cell”, which is at the same time a perfect light emitting diode. This is highly exciting from the physics point of view and directly relevant for application, because performance is increased. Furthermore, the obtained understanding of the defect physics will enable increased long-term stability (one of the major challenges) and accelerate the development of non-toxic lead-free perovskite materials.This work is timely because trial-and-error engineering approaches, which were applied so far, have come to their limits. On the other hand, just now the quality of the ultrathin films used in the solar cell is sufficient to perform in-depth device physics studies, where I am an expert on. Performing and leading this study at LMU will pave the way towards my complete scientific independence.

Оригинален текст от CORDIS (на английски).

Участници

LUDWIG-MAXIMILIANS-UNIVERSITAET MUENCHEN · PlaneggКоординаторГермания