Recent advances in the application of two-dimensional materials as charge transport layers in organic and perovskite solar cells

Abstract

Two-dimensional (2D) materials such as graphene and transition metal chalcogenides (MX2, M: transition metal, X: S, Se, Te) have emerged as a new class of materials due to their high carrier mobility, high transparency, tunable band gap, low cost, and solution-processable properties. These materials can be fabricated into single layers or few layers through facile processes such as chemical vapor deposition or mechanical exfoliation to unlock their superior electrical and optical properties. The ability to tune the work function enables their application as hole transport layers and electron transport layers in optoelectronic devices. In this review, we focus on recent progress in the application of 2D materials as hole transport layers and electron transport layers in organic solar cells and perovskite solar cells.