Influence of the carbazole moiety in self-assembling molecules as selective contacts in perovskite solar cells: interfacial charge transfer kinetics and solar-to-energy efficiency effects

González, Dora A.; Puerto Galvis, Carlos E.; Li, Wenhui; Méndez, Maria; Aktas, Ece; Eugenia Martínez-Ferrero,; Palomares, Emilio

doi:10.1039/d3na00811h

“…As shown in previous works, [ 21 ] δ is a parameter that describes the recombination order in the photovoltaic devices and can be obtained from δ = λ + 1, where λ , which is related to the slope of the power law, is estimated from Equation ():

\left(\tau\right)_{\cdot n} = \left(\tau\right)_{\cdot n 0} \left(\left(\right. \frac{n}{n 0} \left.\right)\right)^{- \lambda}

…”

Section: Resultssupporting

confidence: 71%

“…Encouraged by the advantages and significant impact on device performance observed on carbazole derivatives, [ 21 ] we explored novel derivatives through molecular structure engineering to increase understanding of charge kinetics and ultimately aim to increase the PCE in iPSCs devices. In this study, we have designed four new carbazole‐based compounds, each containing a different functional group ( Scheme ), enabling a thorough analysis of the SAM/perovskite interface and investigating the effects of molecular structure on their surrounding layers.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Interactions at the Interface: Tailoring Carbazole‐Based Self‐Assembled Molecules with Varying Functional Groups for Enhancing the Performance of Inverted Perovskite Solar Cells

González,

Puerto Galvis,

Li

et al. 2024

Solar RRL

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Four different carbazole‐based self‐assembled molecules with different terminal groups have been designed and synthesised as hole‐selective contacts for inverted perovskite solar cells to investigate their interfacial interactions and, consequently, the performance of the devices. Using the carbazole core as a reference, we compared the effect of the thiophen‐2‐yl phenyl, or the hydroxymethyl phenyl attached to the core through a phenyl moiety, with that of the thiophene directly linked to the carbazole. These new self‐assembled molecules have been successfully synthesized using cost‐effective starting materials and a straightforward synthetic method, eliminating the need for expensive and complex purification processes. Subsequently, they have been applied as efficient hole‐selective contact in inverted perovskite solar cells, leading to an outstanding power conversion efficiency of 19.67% in the case of SAM5, containing a carbazole‐core substituted with double 2‐phenylthiophene side arms as functional group. The detailed characterization of the interface and the charge kinetics has allowed us to determine the effect of each substituent.This article is protected by copyright. All rights reserved.

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Tetrapodal Hole‐Collecting Monolayer Materials Based on Saddle‐Like Cyclooctatetraene Core for Inverted Perovskite Solar Cells

Truong,

Ueberricke,

Funasaki

et al. 2024

Angewandte Chemie

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Hole‐collecting monolayers have greatly advanced the development of positive‐intrinsic‐negative perovskite solar cells (p‐i‐n PSCs). To date, however, most of the anchoring groups in the reported monolayer materials are designed to bind to the transparent conductive oxide (TCO) surface, resulting in less availability for other functions such as tuning the wettability of the monolayer surface. In this work, we developed two anchorable molecules, 4PATTI‐C3 and 4PATTI‐C4, by employing a saddle‐like indole‐fused cyclooctatetraene as a p‐core with four phosphonic acid anchoring groups linked through propyl or butyl chains. Both molecules form monolayers on TCO substrates. Thanks to the saddle shape of a cyclooctatetraene skeleton, two of the four phosphonic acid anchoring groups were found to point upward, resulting in hydrophilic surfaces. Compared to the devices using 4PATTI‐C4 as the hole‐collecting monolayer, 4PATTI‐C3‐based devices exhibit a faster hole‐collection process, leading to higher power conversion efficiencies of up to 21.7% and 21.4% for a mini‐cell (0.1 cm2) and a mini‐module (1.62 cm2), respectively, together with good operational stability. This work represents how structural modification of multipodal molecules could substantially modulate the functions of the hole‐collecting monolayers after being adsorbed onto TCO substrates.

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Tetrapodal Hole‐Collecting Monolayer Materials Based on Saddle‐Like Cyclooctatetraene Core for Inverted Perovskite Solar Cells

Truong,

Ueberricke,

Funasaki

et al. 2024

Angew Chem Int Ed

1

0

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Hole‐collecting monolayers have greatly advanced the development of positive‐intrinsic‐negative perovskite solar cells (p‐i‐n PSCs). To date, however, most of the anchoring groups in the reported monolayer materials are designed to bind to the transparent conductive oxide (TCO) surface, resulting in less availability for other functions such as tuning the wettability of the monolayer surface. In this work, we developed two anchorable molecules, 4PATTI‐C3 and 4PATTI‐C4, by employing a saddle‐like indole‐fused cyclooctatetraene as a p‐core with four phosphonic acid anchoring groups linked through propyl or butyl chains. Both molecules form monolayers on TCO substrates. Thanks to the saddle shape of a cyclooctatetraene skeleton, two of the four phosphonic acid anchoring groups were found to point upward, resulting in hydrophilic surfaces. Compared to the devices using 4PATTI‐C4 as the hole‐collecting monolayer, 4PATTI‐C3‐based devices exhibit a faster hole‐collection process, leading to higher power conversion efficiencies of up to 21.7% and 21.4% for a mini‐cell (0.1 cm2) and a mini‐module (1.62 cm2), respectively, together with good operational stability. This work represents how structural modification of multipodal molecules could substantially modulate the functions of the hole‐collecting monolayers after being adsorbed onto TCO substrates.

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Influence of the carbazole moiety in self-assembling molecules as selective contacts in perovskite solar cells: interfacial charge transfer kinetics and solar-to-energy efficiency effects

Abstract: The use of self-assembled molecules (SAMs) as hole transport material (HTMs) in p-i-n perovskite solar cells (iPSCs) has triggered widespread research due to their relatively easy synthetic methods, suitable energy...

Cited by 5 publications

References 22 publications

Exploring the Interactions at the Interface: Tailoring Carbazole‐Based Self‐Assembled Molecules with Varying Functional Groups for Enhancing the Performance of Inverted Perovskite Solar Cells

Exploring the Interactions at the Interface: Tailoring Carbazole‐Based Self‐Assembled Molecules with Varying Functional Groups for Enhancing the Performance of Inverted Perovskite Solar Cells

Tetrapodal Hole‐Collecting Monolayer Materials Based on Saddle‐Like Cyclooctatetraene Core for Inverted Perovskite Solar Cells

Tetrapodal Hole‐Collecting Monolayer Materials Based on Saddle‐Like Cyclooctatetraene Core for Inverted Perovskite Solar Cells

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