| Perovskite solar cell(PSC)has been widely concerned by the researchers since its birth because of the superior photovoltaic performance and low-cost advantages,and has been considered to be the most promising photovoltaic type in the future.However,there are still many problems need to be solved for PSCs at present,among which the two most important and difficult ones are:1.)the difficulty to fabricate high-quality large-area devices with maintained PV performance as small devices;2.)the current still poor stability less than the silicon solar cells.In order to solve the above issues,this paper adopts the full blade-coating technology combined with the developed new electrons transport layer(ETL),which significantly improves the PV performance of large-area perovskite modules.In addition,the undoped hole transport layers(HTLs),copper phthalocyanine and P3HT,were introduced to further improve the device stability with still maintained high efficiency.The specific research work is as follows:First,in view of the requirements for the preparation of large-area perovskite solar modules,a solution based full blade-coating process was developed to realize the large-area coating of electron transport layer,perovskite film layer and hole transport layer with high quality.In this part,we use the blade-coating to replace the conventional spin-coating process to realize the effective fabrication of high-quality films by controlling the coating speed,solution concentration,and post vacuum-flash process.As a result,the fabricated 6×6 cm2 large-area PSC module have reached an efficiency of 14.6%,showing the successful achievement of expansion from small-area devices to the large-area modules.Then,in order to further improve the performance of the device,we designed and prepared a high-performance ZnO-SnO2 hybrid double electron transport layer for the perovskite solar modules.The newly developed double-layer electron transport material could well avoid the disadvantages of low charge transfer efficiency and instability to UV for the conventional TiO2 material.In addition,the more suitable band structure of SnO2 and its charge extraction ability can be utilized to solve the unfavorable demonylation of ZnO.Simultaneously,the high electron mobility for the underlayer ZnO also improve the overall charge transfer ability.subsequently,both the efficiency and repeatability of ZnO-SnO2 based devices have been obviously improved,resulting the efficiency of 6×6 cm2 large-area module devices increased to 17.82%.Finally,to further improve the stability of perovskite devices,the undoped and more stable CuPc and P3HT was introduced to replace the traditional unstable Spiro-OMeTAD based hole transport layer materials.In this part of the study,by optimizing the blade-coating process of CuPc combined with the subsequent annealing treatment,a 6×6 cm2 large module device with efficiency of 15.7%was obtained.And the corresponding module could remained efficiency at 99.6%of the initial PCE even after 10000-s continuous output,and up to 102.7%even after 4-hours’ 85℃ annealing.The efficiency still can maintain 96.8%of the initial PCE after nearly two months’ storage.The above research shows the huge application prospects of the full-bladecoating process in the preparation of large-area,efficient and stable perovskite modules.It also verifies that the developed large-scale process compatible ZnO-SnO2 hybrid electron transport material is very suitable for the fabrication of efficient planar perovskite models.Combined with the new type of undoped hole transport layers,the prepared device modules have also been significantly improved in terms of stability. |
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