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Identifier

000428425

Title

Ultrafast laser spectroscopy of perovskite solar cells

Alternative Title

Υπερταχεία φασματοσκοπία περοβσκιτικών ηλιακών κυψελίδων

Author

Σερπετζόγλου, Ευθύμιος Δ.

Thesis advisor

Στρατάκης, Εμμανουήλ
Χαραλαμπίδης, Δημήτρης

Reviewer

Φωτάκης, Κωνσταντίνος
Κιοσέογλου, Γεώργιος
Κυμάκης, Εμμανουήλ
Ηλιόπουλος, Ελευθέριος
Ρακιτζής, Πέτρος

Abstract

During the last two decades, organic and inorganic lead halide perovskites have attracted tremendous scientific attention due to the extraordinary optical properties and their potential employment in various types of state-of-the-art applications, such as next-generation solar cells (PSCs), light-emitting diodes, lasers, etc. The continuous challenge for solar cells in particular, is to optimize the performance while at the same time improve the stability. In order to address both challenges, the roles of the crystalline quality of the perovskite absorber film, as well as the carrier transport and the recombination processes, between the perovskite absorber and the carrier transport layers, should be understood. Particularly, the physical mechanisms of carrier transport between the perovskite active layer and the hole transport layer (HTL), which is the layer that collects the holes, as well as the electron transport one (ETL), which is the layer that collects the electrons. In this thesis, we shed light on such physical mechanisms by means of femtosecond time-resolved absorption spectroscopy. In particular, it is shown that the photo-excited carrier dynamics are strongly correlated with the surface properties of the employed transport layer as well as with the electrical characteristics of the devices. Furthermore, the charge carrier dynamics are monitored, in-situ, in order to observe their evolution during the perovskite absorber crystallization process in various temperatures, from 85 K up to 250 K, and extract useful information about the effect of the crystal structure on the carrier transport properties. It is envisaged that the novel findings of this thesis could help to a better understanding of the physical phenomena that take place in PSCs after photoexcitation, with the ultimate aim to further enhance the device efficiency, while at the same time to improve the stability.

Language

English

Subject

Change carrier dynamics

Ultrafast transient absorption spectroscopy

Διπλά αστρικά συστήματα εκπομπής ακτίνων Χ

Δυναμική φορέων

Περοβσκιτικές ηλιακές κυψελίδες

Issue date

2020-02-24

Collection

School/Department--School of Sciences and Engineering--Department of Physics--Doctoral theses