| In recent years,the power conversion efficiency(PCE)of the organic-inorganic hybrid perovskite solar cell has risen from 3.8%to 23.3%.The development is very fast and it attracts tremendous attentions of scientists all over the world.From the perspective of performance,the organic-inorganic hybrid perovskite film has many advantages,such as high carrier mobility,long diffusion distance,high molar extinction coefficient and wide spectral absorption and so on.In view of the preparation process and cost,perovskite solar cells have the advantages of simple production process and low production cost.Therefore,perovskite solar cells are the promising one in the third generation of solar cells.How to improve the performance of perovskite solar cells and how to realize industrialization have become hot spots in the field of photovoltaics.Although perovskite solar cells have excellent performances,there are still some obvious shortcomings that restrict the industrialization of perovskite cells.For example,the perovskite film is sensitive to water,heat,light.The hole-transporting material(HTM),as an important component of the solar cell,is difficult to prepare and its cost is expensive.The precious metal used for the electrode is expensive.This thesis is mainly focused on the preparation of organic hole-transporting materials with simple synthesis and low cost to replace the traditional expensive and unstable hole-transporting material such as Spiro-OMeTAD.The triphenylamine group was introduced to the copper phthalocyanine molecule by structural designing to obtain the copper phthalocyanine derivative named CuPc-OTPAtBu.Combined with the low-temperature conductive carbon as the counter electrode,a new type of perovskite solar cell was prepared which was featured with low cost,stability and good performance.The hydrophobic P-type dopant material F4-TCNQ can be used to improve the charge transfer ability of CuPc-OTPAtBu,which served as a hydrophobic layer that protects the perovskite film to improve the overall stability of perovskite solar cell.The perovskite solar cell based on hole-transporting material CuPc-OTPAtBu with 6%F4-TCNQ exhibited the photoelectric conversion efficiency(PCE)of 15.0%.The copper phthalocyanine CuPc-DMP serving as hole-transporting material was designed and synthesized to replace Spiro-OMeTAD,CuPc-DMP exhibited good properties such as low cost,high charge mobility,and easy solution fabrication.This copper phthalocyanine derivative shows good photoelectric property based on a serial of tests.The perovskite solar cell based on CuPc-DMP as the hole-transporting material was optimized to obtain the PCE of 17.1%.Referred to the molecular structure of pentacene-TIPS,the copper phthalocyanine derivative CuPc-TIPS was synthesized.An efficient new type of perovskite solar cell was also prepared with low temperature conductive carbon as the counter electrode.Moreover,the hydrophobicity of CuPc-TIPS can effectively protect the perovskite film layer and improve the overall stability of the perovskite solar cell.The perovskite solar cell based on the undoped CuPc-TIPS as the hole-transporting material had a PCE of 14.0%.The hole-transporting materials CuPc-Bu and CuPc-OBu were designed and synthesized by incorporting two different groups of n-butylphenoxy group and n-butoxyphenoxy group on the molecule of copper phthalocyanine.The different substituent groups of CuPc-Bu and CuPc-OBu can affect the molecular packing and interfacial accumulation of copper phthalocyanine.With interface engineering,2D perovskite material was prepared onto the 3D perovskite material,and the wide band of 2D perovskite is favorable to suppress the interface electron recombination to solve problem that the low LUMO of CuPc-Bu and CuPc-OBu,resulting in serious interface electron recombination.Moreover,The hydrophobicity of CuPc-OBu could improve the overall stability of the perovskite solar cell.The perovskite solar cell based on the undoped CuPc-OBu as hole-transporting material revealed a PCE of 17.6%. |
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