Perovskite/Graphene\nSolar Cells without a Hole-Transport Layer

Abstract

This\nstudy was conducted with the objective of improving the stability\nof perovskite solar cells by using the unique characteristics of graphene\nin order to facilitate the widespread application of such solar cells,\nfor example, in multijunction devices. We consequently developed a\nnew transfer method for graphene using vacuum lamination and, using\ngraphene, successfully fabricated a perovskite solar cell that does\nnot require a hole-transport layer. Initial stability tests indicated\nthat the new device has better stability than a control perovskite\nsolar cell using spiro-OMeTAD. Although the new solar cell design\nexhibited poorer cell performance than the control, we determined\nvia modeling that its performance can be improved by modifying the\ninterface state between perovskite and graphene or by modulating the\nwork function of graphene.