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A two-fold engineering approach based on Bi2Te3 flakes towards efficient and stable inverted perovskite solar cells

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Abstract

Perovskite solar cells (PSCs) are currently the leading thin-film photovoltaic technology owing to their high power conversion efficiency (PCE), as well as their low-cost and facile manufacturing process. Two-dimensional (2D) materials have been reported to improve both the PCE and the stability of PSCs when incorporated across the device's layered configuration. Hereby, a two-fold engineering approach is implemented in inverted PSCs by using ultra-thin Bi2Te3 flakes, i.e.: (1) to dope the electron transport layer (ETL) and (2) to form a protective interlayer above the ETL. Thorough steady-state and time-resolved transport analyses reveal that our first engineering approach improves the electron extraction rate and thus the overall PCE (+6.6% vs. reference cells), as a result of the favourable energy level alignment between the perovskite, the ETL and the cathode. Moreover, the Bi2Te3 interlayer, through the second engineering approach, facilitates further the electron transport and in addition protects the underlying structure against chemical instability effects, leading to enhanced device performance and stability. By combining the two engineering approaches, our optimised PSCs reach a PCE up to 19.46% (+15.2% vs. reference cells) and retain more than 80% of their initial PCE, after the burn-in phase, over 1100 h under continous 1 sun illumination. These performances are among the highest reported in the literature for inverted PSCs.

Graphical abstract: A two-fold engineering approach based on Bi2Te3 flakes towards efficient and stable inverted perovskite solar cells

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Supplementary files

Article information


Submitted
03 Apr 2020
Accepted
08 May 2020
First published
11 May 2020

This article is Open Access

Mater. Adv., 2020, Advance Article
Article type
Paper

A two-fold engineering approach based on Bi2Te3 flakes towards efficient and stable inverted perovskite solar cells

D. Tsikritzis, K. Rogdakis, K. Chatzimanolis, M. Petrović, N. Tzoganakis, L. Najafi, B. Martín-García, R. Oropesa-Nuñez, S. Bellani, A. E. Del Rio Castillo, M. Prato, M. M. Stylianakis, F. Bonaccorso and E. Kymakis, Mater. Adv., 2020, Advance Article , DOI: 10.1039/D0MA00162G

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    [Original citation] - Published by The Royal Society of Chemistry.

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