Muhammad A Hasib1,2, Sam-Shajing Sun1,2,3*
1Center for Materials Research, Norfolk State University, USA
2PhD Program in Materials Science and Engineering, Norfolk State University, USA
3Chemistry Department, Norfolk State University, USA
*Corresponding author: Sam-Shajing Sun, Norfolk State University, 700 Park Ave, Norfolk, Virginia, 23504, USA.
Received: November 8, 2019
Published: November 25, 2019
A cD-ncB1-cfA type of block copolymer (DB1fA), where cD is an electron- donating conjugated block, ncB1 is a non-conjugated bridge unit containing one methylene unit, and cfA is an electron-accepting conjugated and fluorinated block, has been investigated for correlations between optoelectronic properties versus the solid morphologies. Specifically, three different temperatures were used to thermally anneal the block copolymer films and the solar cells were fabricated under the same condition so that correlations between morphology vs. optoelectronic properties can be compared and evaluated. One key observation is that an intermediate surface roughness or nanophase separation at about 8nm appear exhibiting orders of magnitude better optoelectronic properties as compared to either 4 nm or 14 nm surface roughness in the light harvesting devices.
Keywords: Block Copolymers; Conjugated Donor Blocks; Conjugated Acceptor Block; Non-Conjugated Bridges; Morphologies; Nanophase Separations; Optoelectronic Properties; Photo Induced Charge Separations; Light Harvesting; Energy Conversion