Technology And Photoelectric Degradation Of Carbon Electrode Mesoporous Perovskite Solar Cells

Photovoltaic has been realized as a suitable generating electrical power by converting solar radiation into direct current electricity for the fulfillment of increasing world energy consumption with the least impact on the environment.Perovskite solar cells(PSCs)as one of promising member have attracted attention because of their rapid increase in power conversion efficiency(PCE)in the last few years.The latest certified PCE value of 22.7%is approaching that of commercial monocrystalline silicon solar cells.Generally,PSCs prevalently employ an expensive organic semiconductor as a hole transport material(HTM),however,most high-performance organic semiconductor are operationally unstable.In addition,the counter electrodes(CEs)of these high performance photovoltaic devices still need noble mental such as Au or Ag,the most of back contacts in PSCs have still been achieved with vapor deposited.Whose high cost are very likely to hamper the industrial deployment of perovskite photovoltaic technology.Therefore,we develop alternative back contacts that are earth-abundant and energy non-intensive for HTM-free and stable PSCs,Optimize the technology of PSCs,study its application in photoelectric degradation.We designed HTM-free mesoscopic perovskite solar cells C/ZrO2/m-TiO2/c-TiO2/FTO that use a double layer of TiO2 and ZrO2 as a scaffold,a carbon paste was printed as a back contact,the ZrO2 film as insulated layer separates the TiO2 film and carbon film,avoiding any direct contact.In which the perovskite solution was drop into the TiO2/ZrO2 scaffold by two-step sequential method.Critical parameters regarding to carbon-based solar cells were extracted.When thickness of spacer layer is 200 nm,the content of MAI is 9 mg/mL and loading time is 50 s,temperature of substrate and PbI2 solution are 50 0C,the device exhibits the best performance.Based on the above work,printing the carbon paste on the perovskite layer limits the quality of the interface between the perovskite layer and carbon electrode.Herein,an attempt to enhance the performance of the paintable carbon-based PSCs was made using multi-walled carbon nanotubes(CNT)and methylamine(CH3NH2).The results show that CNT induce the increase of current density but invalid on fill factor.CH3NH2 convert rough MAPbI3 perovskite film into a fully dense,smooth film,significantly increasing fill factor.We have fabricated low temperature carbon-based HTM-free mesoscopic perovskite devices.The best device show PCE of 10.39%and stay 84%after testing 1000 h.In the end,we verified the applied possibility of PSCs through PSCs-TiO2 tandem assembly for degradation of rhodamine B(RhB),the two light-harvesting modules are arranged in series,TiO2/CNT composite photoanodes were prepared.The results demonstrated that the addition of 0.75 wt.%CNT in the TiO2 remarkably enhanced the PEC degradation efficiency.The photoelectric catalysis device degrade of rhodamine B over 95%in 80 min,and still remain stable after working 320 min.