Effect of Perovskite Thickness on Electroluminescence and Solar Cell Conversion Efficiency

Monika Rai, Lydia Helena Wong*, Lioz Etgar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

A hybrid organic-inorganic perovskite in a diode structure can lead to multifunctional device phenomena exhibiting both a high power conversion efficiency (PCE) of a solar cell and strong electroluminescence (EL) efficiency. Nonradiative losses in such multifunctional devices lead to an open circuit voltage (Voc) deficit, which is a limiting factor for pushing the efficiency toward the Shockley-Queisser limit. In this work, we analyze and quantify the radiative limit of Voc in a perovskite solar cell as a function of its absorber thickness. We correlate PCE and EL efficiency at varying thicknesses to understand the limiting factors for a high Voc. With a certain increase in perovskite thickness, PCE improves but EL efficiency is compromised and vice versa. Thus, correlating these two figures of merit of a solar cell guides the light management strategy together with minimizing nonradiative losses. The results demonstrate that maximizing absorption and emission processes remains paramount for optimizing devices.

Original languageAmerican English
Pages (from-to)8189-8194
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume11
Issue number19
DOIs
StatePublished - 1 Oct 2020

Bibliographical note

Publisher Copyright:
Copyright © 2020 American Chemical Society.

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