The Research Of Organic-inorganic Hybrid Solar Cell Based On ZnO

Recently, more and more efforts have been devoted to the research of solar cells because of the deficiency of energy. Organic solar cells and inorganic solar cells have their own advantages and disadvantages, in some aspects, they are complementary. Organic-Inorganic hybrid solar cells attract much attention for its potential to combine the good flexibility and manufacturability of organic materials with the high mobility and stability of inorganic materials, it has been one of hot research directions. ZnO is an important n-type semiconductor material, small toxicity, simple synthesise, rich source,have been widely used in the solar cells.In this paper, firstly,we synthetized nanoZnO,explored its properties,then applied it in the solar cells, which was used as the modified layer or acceptor material.The details as follow:1、the research of the lowest temperature to fabricate ZnOWe firstly prepared the ZnO precursor solution using Zn(CH3COO)2·2H2O as the zinc sorce.Then spun it on the quartz plate,annealed at different temperature for20min. Using uv-visible absorption spectrum,XRD,EDS to detective, We found ZnO could be synthetized at the temperature of120℃. To make sure whether it has a good property,using it as the cathode modified layer,we fabricated the solar cell with the device structure of ITO/PEDOT:PSS/P3HT:PCBM/ZnO/Al.The result illustrated ZnO modified layer could effectively improve the device performance, short-circuit current and the fill factor had been improved greatly.When the rotate speed is5000r/min had the best improvement,Jsc increased from6.02mA/cm2to6.69mA/cm2,FF increased from35.4%to42.1%.2、Study the influence of annealing temperature to ZnO morphology,spectulate the growth mechanism,then apply it in solar cellsZnO films were fabricated on a quartz substrate,varying the annealing temperature from120℃to400℃.The SEM patterns illustrated that, with the increase of temperature, the film became from continuous to discontinuous, and the size of ZnO nanoparticle gradually increased,also the film had the tendency growing in (0001).To emphasis the impact of the growth priority in (0001),we fabricated ZnO nanorod.Then made the solar cells with the device structures of ITO/ZnO (different annealing temperature)/P3HT/Ag, ITO/ZnO/ZnO nanorod/P3HT/Ag.The main result was short circuit current increased, open voltage reduced with the increase of temperature.3、the research of P3HT:ZnO hybrid solar cellWe had ever known the lowest temperature to fabricate ZnO is120℃,and it had a good property.To make P3HT:ZnO solar cells, we had a research on the hybrid solution ZnO precursor blended with P3HT. We found it can form P3HT:ZnO film at the annealing temperature of120℃and ZnO can uniformly scattered in P3HT.Then fabricated the solar cells with the device structure of ITO/PEDOT:PSS/P3HT:ZnO/Al, discussed the influence of different proportion, annealing time, modified layer. When the volumn proportion of P3HT:ZnO was1:1, had a good result,Jsc was19.5μA/cm2,Voc was0.42V. With the optimization of annealing time and the addition of modified layer, Jsc up to37.9μA/cm2,Voc up to0.82V. Lastly adding ZnO precursor to P3HT:PCBM, the appropriate addition could improve the performance.