Carbazole-based self-assembled monolayers, hole-selective contact for efficient perovskite solar cells
Artiom Magomedov a, Amran Al-Ashouri b, Elzbieta Pocobut a, Eike Köhnen b, Ernestas Kasparavičius a, Tadas Malinauskas a, Steve Albrecht b, Vytautas Getautis a
a Department of Organic Chemistry, Kaunas University of Technology, Radvilenu 19, 50254, Kaunas, Lithuania
b Young Investigator Group Perovskite Tandem Solar Cells, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Germany, Germany
Proceedings of Internet Conference for Quantum Dots (iCQD)
Online, Spain, 2020 July 14th - 17th
Organizers: Quinten Akkerman, Raffaella Buonsanti, Zeger Hens and Maksym Kovalenko
Poster, Tadas Malinauskas, 071
Publication date: 3rd July 2020

We present a second-generation hole transporting materials capable of forming a self-assembled hole-selective monolayer (SA-HSM).

Perovskite p-i-n architecture solar cells with the second generation SA-HTMs demonstrated very promising power conversion efficiency close to 21% and average fill factor of over 80%. Due to the excellent bonding to the substrate surface, these layers are relatively tolerant against perovskite processing and can ensure a conformal coverage of textured surfaces. Application of the developed materials in tandem perovskite/silicon solar cells resulted in record 29.15 % efficiency devices.

Forming SA-HSM on the transparent electrode circumvents the disadvantages of spin-coating while offering the benefits of uniformly formed layers with minimized thickness, very low material consumption (1 g of the material is enough to cover up to 1000 m2 of the surface) and helps to avoid doping procedures. The materials are commercially available from Tokyo Chemical Industry Co., LTD or Dyenamo AB.

These materials were developed for the application in perovskite solar cells, however ease of structural modifications and use of versatile anchoring group opens the path for application in other areas as well, for example quantum dots and quantum dot-based devices.

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