Perovskite/Graphene Solar Cells without a Hole-Transport Layer

Abstract

This study was conducted with the objective of improving the stability of perovskite solar cells by using the unique characteristics of graphene in order to facilitate the widespread application of such solar cells, for example, in multijunction devices. We consequently developed a new transfer method for graphene using vacuum lamination and, using graphene, successfully fabricated a perovskite solar cell that does not require a hole-transport layer. Initial stability tests indicated that the new device has better stability than a control perovskite solar cell using spiro-OMeTAD. Although the new solar cell design exhibited poorer cell performance than the control, we determined via modeling that its performance can be improved by modifying the interface state between perovskite and graphene or by modulating the work function of graphene.

The role of carbon-based materials in enhancing the stability of perovskite solar cells

“…A new transfer method by a vacuum lamination process was developed by Ishikawa et al in order to use GR as an HSL. 196 Vacuum lamination is a process that binds the layers together under pressure and vacuum. Although the device based on GR HSL showed lower efficiency, it had better stability in comparison to spiro-OMeTAD devices.…”

All‐Dry Hydrophobic Functionalization of Paper Surfaces for Efficient Transfer of CVD Graphene

“…Due to its unique electrical, mechanical, optical, and thermal properties, graphene, a 2D monolayer of sp 2 ‐bonded carbon atoms, has been the focus of a vast number of scientific researches . For decades, tremendous effort has been undertaken to integrate graphene and related materials into real‐world applications to make use of such unique properties in high‐tech end products, such as transistors, light‐emitting diodes, strain sensor, solar cells, biosensor, and chemical/biological sensors . Although there are a number of different techniques in which graphene can be isolated, chemical vapor deposition (CVD) is by far the most promising way to produce structurally well‐defined graphene layers on relatively large areas.…”

Towards Simplifying the Device Structure of High‐Performance Perovskite Solar Cells

“…The most common one is based on a conventional regular structure (TCO/ETL/perovskite/gold or carbon) (Table 2). [25,48,86,87,[89][90][91][92][93][94][95][96][97][98][99][100][101][102][103] This type was first designed by Etgar and co-workers in 2012. The other type is the printable Figure 6.…”