Study On The Characteristics Of Dye-Sensitized Solar Cells During The "Mature" Based On Electrolyte Chemistry Environments

The complete dye-sensitized solar cell（DSSC）life cycle should include three stages: mature,stable period and decline period.Most of the literature is based on the stable period and decay period: the research based on the stable period focuses on material synthesis,device structure and mechanism research;the decay period research focuses on the aging mechanism and material of the device under high temperature,strong light and other environments Changes in performance.The previous literature research shows that during the period from the preparation of the DSSC device to the stable performance,the performance of the device is in the adjustment stage,which can be called the "mature".The main structure of DSSC is a layered sandwich structure composed of a photoanode composed of a sensitized nanoporous film,an electrolyte layer and a photocathode composed of a catalytic metal.The electrolyte layer in the middle of the device is responsible for the transfer and transportation of energy and substances between the anode and cathode plates,and its chemical environment must affect the performance of the device during development.Unfortunately,the research on the influence of electrolyte chemical environment on the performance of devices in the "mature" has been neglected.Based on this,under the condition of changing the composition of the electrolyte,this paper studies the performance of the adjustment period of the interface between the two sides of the DSSC internal electrolyte layer contact,the main research content:First,the effect of the dye anode-sensitized nanoporous film on the performance of the device during the "mature" was studied.The sintering temperature is used to change the microstructure of the film,and the electroactive area of the film changes with the sintering temperature by means of electrochemical methods.The changes of macro-photovoltaic performance and micro-electron lifetime at different sintering temperatures with time were studied,and the effect mechanism of TiO₂ thin film microstructure on device performance during the "mature" was obtained.Secondly,the effect of the electrolyte layer on the performance of the device during the "mature" was studied.Based on the electrolytes containing Ⅰ₂ and DMPⅡ redox pairs,four electrolytes were prepared by adding Li I and TBP to change the electrolyte composition.With the help of electrochemical techniques such as open-circuit voltage decay meter,the changes of the device’s macro-photovoltaic performance and micro-electron lifetime with time under different electrolyte environments were studied.Obtain the mechanism of the influence of the electrolyte layer on the device performance in the "mature".Finally,the effect of the electrolyte environment on the performance of the photocathode side composed of catalytic metals during the "mature" was studied.By changing the composition of the electrolyte,the change of the impedance of the electrolyte interface with time under different electrolyte environments was studied by means of electrochemical impedance spectroscopy（EIS）.Obtain the mechanism of the influence of the electrolyte environment on the performance of the photocathode in the "mature".The results of this paper have certain theoretical significance for clarifying the working mechanism of DSSC complex system,screening and preparing battery materials,and improving battery efficiency.