Interface Invigation On Silicon Hybrid Cells And Organic Solar Cells

Polymer solar cells have attracted more and more attention because of their wide sources of materials,lightweight,easy manufacturing process,low cost,and flexibility.With the decrease of the energy,the studies of polymers solar cell present great significance and potential value for the development and application of renewable energy.At the moment,the power conversion efficiency?PCE?of polymer solar cell based on blends of conjugated polymers and fullerene derivatives has reached more than 10%.Compared to the mature of the inorganic silicon cell,it is necessary to improve PCE and stability of polymer solar cell.The hybrid solar cell of SiNWs/organic has become a hotspot in photovoltaic field recently,but there is a problem of clusters of silicon nanowires in forming the heterojunction.On the other hand,for the quick development of organic inorganic hybrid perovskite solar cell in recent years,despite the PCE of the organic-inorganic hybrid perovskites solar cells has reached 20%,there are still some works to research,such as device stability,repeatability and physical mechanism.In this thesis,for the hybrid SiNWs/organic and perovskite photovoltaic devices the author adopts the experimental research method to research the influence of silicon nanowires,metal nanoparticles doped and water doped on a particular interface of corresponding photovoltaic devices.In improving the efficiency and stability of the organic inorganic hybrid photovoltaic devices,some interesting achievements are obtained.The thesis includes three parts:1.An investigation on the performance improvement of polymer solar cells made of poly?3-hexylthiophene?and [6,6]-phenyl C61-butyric acid methyl ester?P3HT: PCBM?blend system by introducing Nickel nano-particles?Ni Nps?.Using the simplest polymer bulk heterojunction structure,Ni Nps of localized plasmon resonance effect in polymer solar cells is researched.The results show that devices of light absorption and the short current improve markedly and PCE increases to 3.4%,corresponding to a 25% enhancement compared with the reference device without the Ni NPs,when the addition ratio is 2% of Ni NPs.The physical mechanism of the increased light absorption for Ni NPs of the local plasma resonance effect is discussed.2.Interface regulation investigation of alkaline solution on silicon nanowires /PEDOT:PSS hybrid solar cells.The silicon nanowire array with different length and the tapered silicon nanowire array withdifferent morphology were obtained using chemical etching method and alkali treatment technology,and the effect of different substrate morphology on the optoelectronic properties of the hybrid devices was studied.The results show that the length and morphology of the silicon nanowires are the key factor which affects the performance of the devices.When the length of NiNWs is 0.45 ?m,the performance is the best.Furthermore,by optimizing 0.45 ?m NiNWs intruded into alkali solution for 30 s,the obtained TNiNWs were easy to form organic / silicon core shell structure with PEDOT:PSS solution.As a result,PCE of the device was improved from 4.58% to 6.87%.3.Controllable perovskite crystallization by water additive for high?performance solar cells.By adding different proportion water into the perovskite CH₃NH₃PbI₃-xClx precursor solution,the crystalline of the perovskite films under different conditions and the photoelectric properties of corresponding perovskite solar cell were investigated.The results show that when the water adding proportion is 2%,a tiny grain boundary,large-grained,smooth and flat CH₃NH₃PbI₃-xClx films can be attained.Compared with the reference device without water adding,the crystallinity of films,PCE and the stability of the devices with2% water adding were improved.Through the research and analysis of the physical mechanisms,it suggests that incorporating suitable water additives in N,N-dimethylformamide?DMF?leads to controllable growth of perovskites due to the lower boiling point and the higher vapor pressure of water compared with DMF.And hence the high quality perovskite films.