Volume 6, Issue 7 2200128
Research Article

Enhancement of Hole Extraction Efficiency of Dibenzothiophenes by Substitution Engineering: Toward Additive-Free Perovskite Solar Cells with Power Conversion Efficiency Exceeding 20%

Ranush Durgaryan

Ranush Durgaryan

Departament of Polymer Chemistry and Technology, Kaunas University of Technology, LT51423 Kaunas, Lithuania

Department of Chemistry - Ångström Laboratory, Physical Chemistry, Uppsala University, 751 20 Uppsala, Sweden

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Jurate Simokaitiene

Jurate Simokaitiene

Departament of Polymer Chemistry and Technology, Kaunas University of Technology, LT51423 Kaunas, Lithuania

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Dmytro Volyniuk

Dmytro Volyniuk

Departament of Polymer Chemistry and Technology, Kaunas University of Technology, LT51423 Kaunas, Lithuania

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Oleksandr Bezvikonnyi

Oleksandr Bezvikonnyi

Departament of Polymer Chemistry and Technology, Kaunas University of Technology, LT51423 Kaunas, Lithuania

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Yan Danyliv

Yan Danyliv

Departament of Polymer Chemistry and Technology, Kaunas University of Technology, LT51423 Kaunas, Lithuania

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Byeong Jo Kim

Byeong Jo Kim

Department of Chemistry - Ångström Laboratory, Physical Chemistry, Uppsala University, 751 20 Uppsala, Sweden

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Kai Lin Woon

Corresponding Author

Kai Lin Woon

Laboratoire de Physicochimie des Polymères et des Interfaces, EA 2528, CY Cergy Paris Université, 95031 Cergy-Pontoise Cedex, France

Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, Kuala Lumpur, 50603 Malaysia

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Gjergji Sini

Corresponding Author

Gjergji Sini

Laboratoire de Physicochimie des Polymères et des Interfaces, EA 2528, CY Cergy Paris Université, 95031 Cergy-Pontoise Cedex, France

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Gerrit Boschloo

Corresponding Author

Gerrit Boschloo

Department of Chemistry - Ångström Laboratory, Physical Chemistry, Uppsala University, 751 20 Uppsala, Sweden

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Juozas Vidas Grazulevicius

Corresponding Author

Juozas Vidas Grazulevicius

Departament of Polymer Chemistry and Technology, Kaunas University of Technology, LT51423 Kaunas, Lithuania

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First published: 20 April 2022
Citations: 4

Abstract

Replacement of hole-transporting materials (HTM) for additive-free perovskite solar cells (PSCs) is an urgent issue. In this work, three new derivatives of dibenzothiophene with methoxyphenyl, trimethoxyphenyl, carbazole moieties are synthesized as hole-transporting materials for PSCs. The hole density dynamics and hole transporting properties of synthesized dibenzothiophene derivatives are investigated by combination of the charge extraction by linearly increasing voltage (CELIV) and time-of-flight (TOF) techniques. The TOF hole mobility (μh) of one compound reaches the highest value of 4.2 × 10−3 cm2 V−1s−1 at an electric field of 2.5 × 105 V cm−1, however additive-free layers in PSCs did not show the best performance. Instead, the PSC efficiency is determined by a trade-off between the hole-mobility properties and the “effective” hole recombination rate kB ranging 0.5–40.3 ms−1 as determined by means of the CELIV method. The best hole extraction properties are observed for a compound with μh of 9.45 × 10−4 cm2 V−1s−1 and kB of 11.8 ms−1 which is coherent with its lowest energetic disorder σ of 78.2 meV. Having both appropriate hole density dynamics and hole-transporting properties, hole-transporting layer of that compound allows to reach PCE of 20.9% for additive-free PSC, which is among the state-of-art values for devices with undoped HTM.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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