title: Squaraine dyes for dye-sensitized solar cells: recent advances and future challenges.
abstract: In the past few years, squaraine dyes have received increasing attention as a sensitizer for application in dye-sensitized solar cells. This class of dyes not only leaves open a good opportunity to afford conventional high performance dyes but also holds great promise for applications in transparent solar cells due to its low absorption intensity in the eye-sensitive region. This review provides a summary of the developments on squaraine dyes in the field of dye-sensitized solar cells and the opportunities used to improve their overall energy conversion efficiency. In particular, the main factors responsible for the low values of open-circuit voltage, short-circuit photocurrent and fill factor are discussed in detail. Future directions in research and development of near-infrared (NIR) organic materials and their applications are proposed from a personal perspective.
authors.affiliation: Photovoltaic Materials Unit, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan.
authors.forename: Chuanjiang
authors.initials: C
authors.lastname: Qin
authors.forename: Wai-Yeung
authors.initials: WY
authors.lastname: Wong
authors.forename: Liyuan
authors.initials: L
authors.lastname: Han
keywords: absorption; dye-sensitized solar cells; energy conversion; sensitizers; squaraines