Research On Anode Interface Modification Of Organic Solar Cells With Solution-prepared MoO₃

Currently,how to make efficient use of solar energy become the focus of the scientific research and the industry areas.Solar cells are use directly to converted solar energy into power for mankind due to solar energy being a clean,non-polluting and inexhaustible new energy.So far,solar cells as a unique and innovative technology for solar energy has been developed into the third generation,the conversion efficiency?PCE?of organic solar cell device has exceeded 12%,the challenge is how to further improve the device performance and achieve good stability of the battery device with low production cost.The excellent performance of the anode buffer layers?ABLs?is beneficial to improve the PCE and stability of the device.The use of solutionprepared MoO₃ ABLs is beneficial to improve the device performance and manufacturing cost.In this paper,the high-performance MoO₃ ABLs have been developed to control the organic/anode interface characteristics as following aspects:?I?Developping the MoO₃ ABLs with solution processing and low temperature treatment.?II?Developping the MoO₃ ABLs that improves the compatibility of the electrode with the photoactive layer.?III?Doping the MoO₃ anode interface buffer layer.Main research results are as follows:?1?We report a simply synthetic method to prepare amorphous molybdenum oxide using the favorably stable peroxomolybdic acid organosol as the precursor solution prepared by the ultrasonic reaction.The favorably smooth and dense surface morphology of the MoO₃ layers are obtained under 150? thermal treatment with the good optical properties and matched energy level structure.By optimizing the annealing temperature of the film,it has been found that the performance of the device is best when the heat treatment is carried out at 150?.The P3HT:PC71BM devices with MoO₃ ABLs under 150? has a PCE of 4.02%,a VOC of 0.59 V,a JSC of 10.70 m A cm-2,and a FF of 63.7%.And the PTB7:PC71BM devices with the MoO₃ ABLs has a PCE of 8.46%,a VOC of 0.73 V,a JSC of 17.02 m A cm-2,a FF of 68.1% for 150?.By comparing the stability of the devices based on MoO₃ and PEDOT: PSS as ABLs,MoO₃ can effectively improve the device stability as the anode interface modification material.?2?CTAB modified MoO₃ films prepared with CTAB as modifier have good surface morphology and electrical structure.The effect of CTAB on the heat treatment is significant for CTAB modified MoO₃ films.The CTAB-modified crystalline MoO₃ thin films are used as the anode interface modification layer in P3HT: ICBA device and PTB7: PC71 BM cell device.The results show that the performance of the device is best when the heat treatment is performed at 200?.The P3HT: ICBA device and PTB7: PC71 BM battery device based on CTAB modified crystal MoO₃ ABLs are better than the corresponding devices based on PEDOT: PSS interface layers.At the same time,MoO₃ as an anode interface modification material can improve the device stability.?3?Ag-doped MoO₃ thin films prepared by solution method have been used as ABLs of bulk heterojunction solar cell.The performance of P3HT: ICBA device based on Ag-doped MoO₃ ABLs is significantly higher than that of the undoped MoO₃ ABLs.P3HT: ICBA device based on Ag-doped MoO₃ ABLs is closely related to the doping concentration.The dopant concentration increases from 0.1% to 1.5%,Voc of the device does not change obviously,FF and JSC increased first and then decreased.When the doping concentration is 0.8%,the performance of the battery device is the best.