Production Technology Of Large Area Perovskite - Type Solar Cells And Components

Recently, perovskite solar cell（PSC） has been a new research direction of solar cells.PSC has attracted considerable attention recently for exhibiting several significant advantages, such as high absorption for visible light, bipolar transportation, and easy fabrication, etc. Especially, the power conversion efficiency（PCE） of PSC has developed from 2.2%（2006） to 20.1%（2015） within just 10 years. The speed of the development of PSC is unprecedented.In this thesis, the large area perovskite solar cell（LPSC） based on the structure of FTO/cp-TiO₂/meso-TiO₂/CH₃NH₃PbI₃/Carbon was studied. Three parts of LPSC,including the fabrication process, the structure and the perovskite layer, had been optimized. And the fabricating process of perovskite solar cell modules（PSCM） was preliminarily studied.（1） Fabricating perovskite layer with sequential deposition. The effects of hot-press for LPSC and the working area of cells on the performance of LPSC were studied specifically. And it was illustrated that the LPSC with meso-structure performed better than the LPSC with planar-sturcture by some test. And the highest and average PCE of meso-structured cell with the working area of 1.5cm2 were 1.31% and 1.02% respectively.So the hot-pressed meso-structured LPSC was regarded as reference in this thesis.（2） The optimization for the reference LPSC. First of all, the performance of different meso-sturcture, which were two different kinds of single-mesoporous layer and two different kinds of double-mesoporous layers, of reference LPSC were compared.Then the LPSC with double-mesoporous layers of TiO₂/ZrO₂ performed best. Then the LPSC was optimized by doping the perovskite layer with Cl^-, 5-AVA⁺, and both Cl^- and 5-AVA⁺, respectively. After doping, the morphology of perovskite and the transportation of carriers were improved, and the recombination between electrons and holes was also reduced. As a result, the performance of LPSCs was improved. When perovekite based on double-mesoporous layer of TiO₂/ZrO₂ was doped with both Cl^- and 5-AVA⁺, the performance of LPSCs was further improved as expected. The optimized LPSCs with the working area of 1.5cm2 finally achieved the highest PCE of 1.82% in this thesis.（3） In order to fabricate PSCMs, the preparation of perovskite layer was changed from sequential deposition to one-step spin-coating, and the preparation of TiO₂ mesoporous layer was changed from spin-coating to screen print. The performance ofLPSCs fabricated by sequential deposition was compared with the performance of LPSCs fabricated by one-step spin-coating, and the latter performed better. After doping perovskite with both Cl^- and 5-AVA⁺, the PEC of cells were further improved. However,the PSCMs did not work well.