Degradation of electrical properties of small molecule organic solar cells under oxygen and moisture. Issue 1695 (11th June 2014)

• Record Type: Journal Article
• Authors: Ciammaruchi, Laura; Carlo, Aldo Di; Tang, Ching W.
• Is Part Of: MRS proceedings. Issue 1695(2014)
• Publication Date: 2014-06-11
• Subjects: photovoltaic, -- thin film, -- organic; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/opl.2014.582
• Languages: English
• ISSNs: 0272-9172

Abstract

ABSTRACT: We investigated the photovoltaic (PV) parameters of a planar hetero-junction solar cell with di-[4-(N, Nditolyl-amino)-phenyl] cyclohexane (TAPC) as donor (D) and C60 as acceptor (A), upon exposing the acceptor side to oxygen and moisture. We found that for the same time of exposure, even minor oxygen amounts lead to more detrimental results compared to moisture. We argue that the photo-conversion efficiency (PCE) decreases due to creation of recombination centers at the interface, which induce losses in exciton diffusion and charge generation. Under the same conditions, we also registered a direct connection between the cell PV parameters' decay and a C60 thin-film conductivity loss.