Research On Preparation Of Flexible Fibrous Carbon-based Perovskite Solar Cells And Application Of Integrated System

With the rapid developments of mobile Internet and smart terminals,flexible wearable electronic devices present a huge market application prospect,which puts forward an urgent and challenging demand for flexible wearable electronic power supplies.However,traditional wearable energy devices have problems such as poor flexibility,heavy weight,and large size,which cannot meet the electricity demand of many microelectronics,which limits the development and wide application of flexible wearable electronic devices.Fibrous energy devices are easy to carry due to their high flexibility,light weight.Therefore,it has become a research hotspot in the field of flexible wearables.At present,human life is inseparable from electric energy,and electric energy is fast in transmission and convenient in storage.Solar energy is a form of energy available everywhere,and photoelectric conversion is one of the best ways to mine solar energy to obtain electricity.The important devices for photoelectric conversion include dye-sensitized solar cells(DSSCs),perovskite solar cells(PSCs)and so on.Herein,the main research point of this thesis is to research and prepare flexible fibrous carbon-based perovskite solar cells(C-PSCs),which based on the preparation of flexible fibrous DSSCs.And finally,integrate and apply the fibrous solar cells prepared,to prepare a self-powered flexible sensing system that has a wide range of applications in the field of flexible wearables.It mainly includes the following points:(1)The photoanode of PSCs was researched and prepared.At first,based on the preparation of semiconductor Zn O nanoarrays in fibrous DSSCs,Zn O-based semiconductor photoanodes were explored,but perovskite could not form a dense film on the basis of Zn O nanoarrays.Then,Ti O₂-based semiconductor photoanodes were prepared and applied in C-PSCs to obtain certain photoelectric properties.In order to further verify the feasibility of the Ti O₂-based semiconductor photoanode,it was also applied to the fibrous DSSCs,and achieved the normal output performance of the fibrous DSSCs.(2)Research and preparation of flexible fibrous C-PSCs,the structure of which is Ti wire/dense Ti O₂/mesoporous Ti O₂/perovskite(CH₃NH₃Pb I₃)/C.Based on the preparation of the Ti O₂-based semiconductor photoanode,the preparation conditions of other functional layers of PSCs were explored to prepare devices with better output performance.First of all,three different methods,namely dip-coating-pull method,electrodeposition method and electric heating assisted film formation method were used to explore the film forming conditions of the perovskite light-absorbing layer.Among them,the calcium produced by the electric heating assisted film formation method The titanium ore light-absorbing layer has the best effect.Secondly,Cu I,carbon materials and spiro-OMe TAD were used as hole-transport layers to prepare and explore.Since the flexible fibrous C-PSCs are brand-new battery structure,there are many uncertain factors,making the film formation of the perovskite light-absorbing layer on the curved surface of the fiber more challenging.Therefore,we adopted the typical structure of PSCs and used the mature spiro-OMe TAD material as the hole-transport layer to further optimize the perovskite light-absorbing layer.Finally,the optimized experimental conditions were applied to the preparation of C-PSCs,and certain effects were achieved.(3)Researched and prepared a coaxial optical fiber type self-powered stretchable integrated strain sensor.The prepared fibrous solar cells,energy storage batteries and stretchable strain sensors are integrated and assembled by winding to realize the integration of energy collection,storage and utilization,thereby forming a coaxial optical fiber type self-powered stretchable integrated strain sensor.The harvested solar energy can be effectively converted into electrical energy through fibrous solar cells,and then stored in the form of chemical energy in a retractable energy storage battery,thereby providing a stable and continuous power source for the stretchable fiber strain sensor.Therefore,the flexible self-powered sensing system can stably and sensitively realize real-time detection of certain movements of various joints or muscles.This has huge application prospects in the fields of flexible wearable,artificial intelligence,and medical monitoring.