Solution-processed colloidal quantum dot/organic hybrid tandem photovoltaic devices with 8.3% efficiency. (January 2017)

• Record Type: Journal Article
• Authors: Aqoma, Havid; Azmi, Randi; Oh, Seung-Hwan; Jang, Sung-Yeon
• Is Part Of: Nano energy. Volume 31(2017:Jan.)
• Page Start: 403
• Page End: 409
• Publication Date: 2017-01
• Subjects: Colloidal quantum dot photovoltaic -- Organic photovoltaic -- Lead sulfide -- Hybrid tandem solar cell -- Intermediate layer; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.10.067
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: High-efficiency colloidal quantum dot (CQD)/organic hybrid tandem photovoltaic devices (HT-PVs) are developed through a low-temperature solution process. PbS-CQDs and blends of PTB7-Th/PC71 BM are used as the active materials for front- and back-cells, respectively. The effective series connection of the two heterogeneous sub-cells is successfully achieved using MoOx/Au/ZnO-based intermediate recombination layers (IMLs). By fine-tuning the current densities in the sub-cells and optimizing the IMLs by balancing the optical and electrical properties, HT-PVs with power conversion efficiency (PCE) of 8.27% ( V OC of 1.27 V, J SC of 10.36 mA cm −2, and FF of 0.63) are achieved. Furthermore, the fabrication of HT-PVs is achievable in ambient atmospheric conditions without thermal annealing that have comparable PCE (7.64%). The PCEs exhibited by these HT-PVs are thus far the highest values reported for CQD-based tandem photovoltaic devices. Graphical abstract: Highlights: Record efficiency (8.3%) for quantum dot/organic hybrid tandem photovoltaic devices. Successful current matching of the two sub-cells with absorption overlap. Development of efficient intermediate layers for hybrid tandem photovoltaic devices. High efficiency (7.6%) quantum dot/organic hybrid tandem photovoltaic devices by room-temperature annealing-free fabrication process.