| 초록 |
Low band gap conjugated polymers with proper energy levels for charge transfer are required to achieve high-efficiency polymer solar cells. We have synthesized new conjugated polymers using indenoindene, benzothiadiazole, and thiophene as the building block. The alternating copolymer PININE-DTBT, PININE-DHTBT, and PININIE-DHOTBT are regioregular. Optical and electrochemical characterizations reveal that all the copolymers have low band gaps and high regioregularity, making them promising materials for the electron donors in polymer solar cells. The polymer solar cells had a layered structure of glass / ITO / PEDOT:PSS / polymer-PCBM blend / Al. The best solar cell performance obtained has a layered structure of ITO / PEDOT:PSS / PININE-DTBT:PCBM(1:3) / Al. Under white light illumination (AM 1.5 G, 100 mW/cm2), the obtained Jsc is 5.86 mA/cm2, Voc is 0.66V, FF is 38%, and PCE is 1.45%. |
