Organic Solar Cells with Inverted and Tandem Structures

Abstract

During the past decade, organic solar cells have attracted great attention due to their wide applicability and potentially low-cost fabrication from printing at low temperature on flexible substrates. Although the technologies of small molecule and polymer solar cells have advanced significantly, the efficiency and stability still need to be improved to fulfill the commercial requirements. In principle, the primary way to improve device performance is to introduce new materials with the properties of broad absorption range, high charge-carrier mobility, and long-term stability. On the other hand, the device performance can be also enhanced by optimizing device structures. In this chapter, we will discuss the recent progress in organic solar cells with inverted and tandem structures, two effective approaches to improve device performance. We will review various interfacial and intermediate layers employed in solar cells based on these concepts. The stability of the devices with these structures in ambient environment will also be discussed.