Preparation And Optoelectronic Properties Of The Ag Nanowires/Al-Doped ZnO Films

AZO films with good light trapping abilities and optoelectronic properties are applied in the front electrodes of thin-film solar cells to effectively improve the optoelectronic conversion efficiency of thin-film solar cells.In order to improve the light trapping abilities of AZO films,AZO films are usually etched to obtain crater-like structures or grown with AZO nanorods（AZO NRs）on their surfaces,but these methods usually affect the conductivity of AZO films.Ag nanowires（Ag NWs）,as metal nanowires,have certain light trapping abilities and electrical properties.If Ag NWs are introduced into AZO NRs to form Ag NWs/AZO films,the light trapping abilities and electrical properties of the films will be improved concurrently.Therefore,the preparation of Ag NWs/AZO films with excellent optoelectronic properties and light trapping abilities has important research significance and application prospects.In this thesis,Ag NWs were prepared by polyol method,and Ag NWs were spin-coated on AZO glass to form Ag NWs films,and then AZO NRs were grown by hydrothermal method to obtain Ag NWs/AZO films.The details of the research contents are as follows.Firstly,different Ag NWs films were prepared by changing the mass of Fe Cl₃·6H₂O solution added during the preparation of Ag NWs and the temperature of the reaction.The structural properties,surface morphologies,optoelectronic properties and light trapping abilities were investigated.The results showed that with the increase of the mass of Fe Cl₃·6H₂O solution,the shape of the Ag generated gradually changed from nanoparticles to NWs,and the length and lap density of Ag NWs gradually increased.However,with the increase of the reaction temperature,the length and lap density of the Ag NWs generated increased and then decreased.As the length and lap density of Ag NWs increased,the light trapping abilities and electrical properties of the Ag NWs films were enhanced.Secondly,AZO NRs were hydrothermally grown on AZO glass coated with Ag NWs films to form Ag NWs/AZO films.In order to study the effect of introducing Ag NWs,AZO NRs were directly hydrothermal grown on AZO glass under the same hydrothermal conditions.The structural properties,surface morphologies,optoelectronic properties and light trapping abilities of the two kinds of films were characterized and compared.The results showed that the light trapping abilities（the haze value at 550 nm was 0.33）and electrical properties（the sheet resistance was 13.8Ω/sq）of the Ag NWs/AZO films were simultaneously improved compared with those of the Ag NWs-free AZO films.Finally,the effects of the growth conditions of Ag NWs（the mass of Fe Cl₃·6H₂O solution and the reaction temperature）and AZO NRs（the concentration of hydrothermal precursors）on the structural properties,surface morphologies,optoelectronic properties and light trapping abilities were investigated.The results showed that the Ag NWs/AZO films prepared by introducing Ag NWs（adding 7 g Fe Cl₃·6H₂O solution,at a reaction temperature of 130°C）into AZO NRs（the hydrothermal precursor concentration of 0.055 M was used）have the best light trapping abilities（the haze value was 0.38 at 550 nm）and conductivity（the sheet resistance was 7.1Ω/sq）.