Abstract: Bulk heterojunction (BHJ) polymer solar cells (PSCs) are regarded as one of the most promising alternatives to inorganic-based solar cells. Recent advances in PSCs performance have resulted from compressing the bandgap to enhance the short-circuit current (JSC) while lowering the highest occupied molecular orbital to increase the open-circuit voltage (VOC), consequently enhance the power conversion efficiency (PCE). However, PCEs of PSCs are still constrained by low JSC, small VOC and low fill factor (FF). In this presentation, I would like share with you how we approach high performance PSCs via device engineering, interfacial engineering and novel materials.
In the first part of my presentation, I would like to address how to overcome 50% energy losses in BHJ PSCs due to strong photogenerated charge carrier recombination within PSCs and low charge carrier mobility of disordered organic materials and get over 50% enhanced efficiency from BHJ PSCs by incorporating novel inorganic nanoparticales and external field alignment.
In the second part of my presentation, I would like to present how to approach high performance inverted PSCs via interfacial engineering… to enhance surface electrical conductivity of electron extraction layer by conjugated polyelectrolytes, neutral fullerene derivatives and ionic liquids.
In the last part of my presentation, I would like to report over 10% efficiency from single-junction PSCs with high JSC, large VOC and high FF by novel two-dimensional donor-acceptor conjugated copolymer.