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Fully doctor-bladed efficient organic solar cells processed under ambient condition
摘要： The low-cost and high-throughout printing techniques are potentially used to process large-area organic solar cells (OSCs). However, high-performance OSCs fabricated via fully printing process have lots of challenges. Herein, OSCs are fabricated via fully doctor blading using subsequently printed electron transport layer (ETL) zinc oxide (ZnO), printed bulk heterojunction (BHJ) active layer composed of poly[(2,6-(4,8-bis(5-(2-ethylhexy)thiophen-2-yl)-benzo[1,2-b:4,5-b’]dithiophene))-alt-(5,5-(1’,3’-di-2-thienyl-5’,7’-bis(2-ethylhexyl)benzo[1’,2’-c:4’5’-c’]dithiophene-4,8-dione))] (PBDB-T) and 3,9-bis(2-methylene-(3-(1,1-dicyano-methylene)-5-methylindanone)-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2’,3’-d’]-s-indaceno[1,2-b:5,6-b’]-dithiophene (IT-M), and printed hole transport layer (HTL) molybdenum oxide (MoO3). Through the optimization of inks and printing parameters， as well as humidity control, OSCs fabricated via printed ETL ZnO in ambient condition and spin-coated BHJ PBDB-T:IT-M in glovebox produce a power conversion efficiency (PCE) of 10.73 %, which is similar to fully spin-coated device. While OSCs fabricated via printed ETL ZnO and BHJ PBDB-T:IT-M in ambient condition can produce a PCE of 10.15 %. Furthermore, the PCE up to 9.34 % can be achieved for fully printed OSCs with doctor-bladed ETL ZnO, BHJ PBDB-T:IT-M and HTL MoO3 in ambient condition. These results suggest that high-performance OSCs can be fabricated using printing techniques in ambient condition instead of spin-coating and inert atmosphere, exhibiting great potential to accelerate the commercialization of OSCs.
关键词： ambient condition,fully printing,organic solar cells,doctor blading
更新于2025-09-23 15:21:01
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Fully Doctor-bladed efficient perovskite solar cells in ambient condition via composition engineering
摘要： It is very meaningful to develop large-scale, low-cost technology for fabricating efficient perovskite solar cells (PSCs) to accelerate their commercialization. Doctor-blading is one of important scalable technologies for processing PSCs, but the power conversion efficiencies (PCEs) of fully doctor-bladed PSCs, including electron transport layer, perovskite layer and hole transport layer, are still lag far behind the PSCs fabricated via conventional spin-coating technology, especially fabricated in ambient condition. Herein, highly efficient planar heterojunction PSCs with a structure of ITO/SnO2/FAxMA(1-x)PbIyBr(3-y)/Spiro-OMeTAD/Ag are achieved by fully doctor-blading technique in ambient condition, in which high-quality perovskite films with low trap-density are fabricated via two-step sequential deposition with a low temperature process by simultaneously introducing composition engineering and additive-doping technology. Organic cation is added into the PbI2 precursor to reduce the uneven distribution of nucleation sites in the perovskite films during doctor-blading process and promote the uniform growth of perovskite grain. Moreover, 2,3,5,6-tetrafluoro-7,7,8,8-tetra-cyanoquinodimethane (F4-TCNQ) acted as the doping additive is employed into perovskite, resulting in healing the perovskite grain boundary and reducing trap-density accordingly. As a result, the doctor-bladed PSCs fabricated in ambient condition exhibit the champion PCE of 18% and a stabilized efficiency of 17.7%. Furthermore, PSCs fabricated via fully doctor-blading in ambient condition achieve the PCE of 17.0% with negligible hysteresis. This work provides an important strategy for scalable fabrication of efficient PSCs in ambient condition and potentially accelerates the commercialization.
关键词： Doctor-blading,Additive,Composition engineering,Perovskite solar cell
更新于2025-09-23 15:21:01