Introducing Organic Interlayer over Self Assembled Monolayers: Boosting Stability of Solution Processable P-I-N based Perovskite Solar Cells with nearly 20% efficiency
Daimiota Takhellambam a, Luigi Angelo Castriotta a, Gloria Zanotti b, Laura Mancini b, Aldo di Carlo a c
a CHOSE- Center for Hybrid and Organic Solar Energy, Electronic Engineering Department, University of Rome Tor Vergata
b Istituto di Struttura della Materia (ISM)
c stituto di Struttura della Materia (ISM)
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Daimiota Takhellambam, presentation 189
Publication date: 20th April 2022

Perovskite solar cells (PSCs) have been deeply studied for its growing photovoltaic performance
in various ways. Such achievement are due to fine optimization of the stacking layers and
experimenting in suitable device architecture. Use of interlayers has been in positive effect in the
fabrication process in improving the efficiency and other parameters. In the past couple of years,
self-assembled monolayers (SAM) have been subjected for use as an alternative or a replacement
as Hole Transport Layer (HTL)1. SAM has been in the limelight due to its efficient passivating
nature at the hole selective interface and a faster charge extraction2. Stability of PSCs is
fundamental to get reliable results that can be transferred to market potential, during the last years
standard stability procedure have been validated also for PSCs, suggesting that research
community must conduct stability tests to confirm the benefit of any kind of modification 3, 4. Here,
for the first time, we have introduced an interlayer small organic molecule 2-
decyl[1]benzothieno[3,2-b][1]benzothiophene (C10-BTBT ) over HTL self-assembled monolayer
(2-(3,6-Dimethoxy-9H-carbazol-9-yl) ethyl) phosphonic acid also known as Meo-2PACz. This
new usage of interlayer over SAM has shown a boost in efficiency giving a maximum power
conversion efficiency of 19.6%, with remarkable stability over light soaking test (ISOS L-1),
showing a T80 of 712h by using solution processable electron transport layers, such as Phenyl-C61-
butyric acid methyl ester (PCBM) and Bathocuproine (BCP), further proving the suitability of this
approach over industrial upscalable R2R technique. This approach can be extended as a common
procedure to reduce the non-radiative loss at the interface between hole selective contact SAM and
perovskite layer.

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