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A color-tuned perovskite solar cell incorporating a distributed Bragg reflector (DBR) composed of copper (I) thiocyanate (CuSCN) and cellulose acetate (CA) was developed to improve the aesthetic appearance of the inherently dark-brown perovskite layer. This study aimed to establish an inkjet printing technique for fabricating dotshaped CuSCN/CA multilayer DBRs with controlled optical properties. Inkjet printing enabled highly reproducible droplet ejection and precise control of dot film formation; however, droplet ejection through an 80 μm-diameter nozzle is highly sensitive to external disturbances. To address this issue, the driving conditions of the inkjet head were optimized to stabilize droplet formation. In addition, the influence of CA film uniformity on the optical performance of the DBR was investigated, and a mixed-solvent approach using diacetone alcohol and acetone was introduced to improve film morphology. As a result, a three-layer CuSCN/CA/CuSCN DBR with uniform multilayer interfaces was successfully fabricated, achieving a maximum reflectance of approximately 40% in the wavelength range of 400-480 nm, in good agreement with the theoretical value of about 38%.
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NAKAHAMA et al. (2026) studied this question.
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