The ATI has over active researchers working on multidiscipline programmes with the NEC being a major research group within the institute. He joined Surrey in Ravi's secondary education was in Sri Lanka, after which he joined the Engineering Department at Cambridge University for his undergraduate and postgraduate work.
PC71BM based bulk heterojunction organic solar cells for over the course of a year. We find that the devices undergo a burn-in process lasting hours followed by a TS80 lifetime of up to hours.
We conclude that in the most stable devices, the observed TS80 lifetime is limited by thermally-induced stress between the device layers, as well as materials degradation as a result of edge-ingress of water or moisture through the encapsulation.
Efficiency rise in PCDTBT:PC70BM organic solar cell using interface additive Rashmi Swami, Rajesh Awasthi, Sanjay Tiwari. Low efficiency is one of the biggest problems with organic solar cell. Towards High Performance Organic Photovoltaic Cells: A Review of Recent Development in Organic Photovoltaics. kutsarov DI, New E, Bausi F, Zoladek-Lemanczyk A, Castro FA, Silva SRP Fabrication of air-stable, large-area, PCDTBT:PC70BM polymer solar cell modules using a custom built slot-die coater Solar Energy Materials and Solar Cells, University of Surrey.
Whilst efforts to design and prepare high efficiency devices have been a main focus in OPV research, less work has been expended in improving device stability and lifetime. Such protocols have since improved the comparability of OPV stability studies conducted by different research groups.
It is clear that the majority of OPV stability studies have been performed under well-controlled laboratory conditions 6789. The most extensive studies on outdoor testing of OPVs over long periods have been performed by the pioneering work of F.
Here, research has mainly focused on devices based on a blend of the polymer poly 3-hexylthiophene-2,5-diyl P3HT and [6,6]-phenyl-Cbutyric acid methyl ester PCBM ; a material set now considered a prototypical system for OPV research. It has been shown that such devices undergo degradation at different rates when positioned outside in different geographic locations, and that effective device encapsulation is crucial in extending lifetime in outdoor testing 1113 The most stable P3HT: We note that much of the recent progress in OPV research has occurred as a result of the development of new polymeric materials, with many of such materials based on a donor-acceptor D-A architecture 202122 This polymer has been shown to have a high degree of photochemical stability, with recent work under accelerated conditions using a solar simulator suggesting that PCDTBT: Notably other studies have extrapolated even longer lifetimes for PCDTBT devices, with operational lifetimes of up to 15 years claimed Here, the large daily and seasonal temperature fluctuations could eventually result in other degradation mechanisms such as delamination within a multi-layer structure or especially if partial exposure to the atmosphere particularly water and moisture occurs during large area processing 2930313233 To explore the importance of such degradation mechanisms, we have performed an extended outdoor lifetime study of the operation of PCDTBT: Here, the choice of casting solvent has been previously shown to have a marked impact on device efficiency 3536however its effect on long-term operation lifetime is unknown.
PC71BM devices undergo a burn-in stage characterized by an initial rapid loss in efficiency, followed by a period of slower, linear degradation - a result also reported in laboratory testing We show that during this post-burn-in period, device efficiency fluctuates as a result of seasonal variations in temperature an effect not observed in laboratory based studies.
We find the burn-in period for PSCs made from different solvent systems are comparable, being around hours, with subsequent degradation dynamics having a TS80 lifetime between 5, and 6, hours being largely independent of the choice of casting solvent.
We speculate that enhanced degradation during the summer months results from a slow breakdown of the device encapsulation or delamination within the device itself caused by repeated thermal cycling.
Our study demonstrates therefore that PCDTBT based OPVs have promising stability when tested under real-world conditions, although this currently appears to be limited by the efficiency of our encapsulation materials and techniques with further refinements in testing protocols being required.
In this study, we have used a poly 3,4-ethylenedioxythiophene: PCDTBT was synthesized using previously reported methods 39 ; and had a number molecular weight Mn of Da and a polydispersity of 2.ユーザー登録をすると、Chris Millsさんの詳細なプロフィールやネットワークなどを無料で見ることができます。 high efficiency organic solar cells -2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl]:[6,6]-Phenyl C71 butyric acid methyl ester (PCDTBT:PC70BM) organic photovoltaic.
In this work, we study both device PCE and stability for a set of PBDT-TT polymers and the effect of an additive on the solar cell performances.
Our results show an enhancement in efficiency ( % rise in PCE) and an accelerated UV-degradation for devices processed with additive. Efficiency Rise in PCDTBT:PC 70 BM Organic Solar Cell Using Interface Additive.
Rashmi Swami, Rajesh Awasthi, Sanjay Tiwari. Abstract.
Solar cell can be designed with photoactive layer of organic and inorganic materials. They were utilized as good electron-donor materials that can be blended with electron-acceptor PC70BM in the fabrication of solution-processed molecular bulk heterojunction (BHJ) solar cells.
All of these BHJ devices showed very high open-circuit voltage (V(oc)) of V, and the best power conversion efficiency achieved was %. Paik-Kyun Shin, Palanisamy Kumar, Abhirami Kumar, Santhakumar Kannappan and Shizuyasu Ochiai, Effects of Organic Solvents for Composite Active Layer of PCDTBT/PC 71 BM on Characteristics of Organic Solar Cell Devices, International Journal of Photoenergy, //, , (1 .
We show the impact of solvents on the morphology of PCDTBT based solar cells. We fine tune the domain size in PCDTBT:PC 70 BM films by using a mixed solvent. We obtained a high PCE of % from PCDTBT:PC 70 BM devices of 1 cm 2.