مونتاژ نقاط کوانتومی در سلول های خورشیدی پلیمری رانده شده توسط سوئیچینگ جهت‌ یابی‌ کریستال مایع تحت میدان الکتریکی

In-situ synthesis and rapid assembly of CdS quantum dots (QDs) in main-chain liquid-crystalline polymer poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene) (PBDTTT-C12) and side-chain liquid-crystalline polymer poly[4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b′]dithiophene-alt-3,6-bis(thiophen-5-yl)2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione] (PBDTDPPcbp) was formed. This was driven by the organization of liquid-crystals (LC) at 150 °C, due to mesotropic state of mesogens. Further under the applied electric field (Vapp), the orientation of QDs could be regulated along with the highly crystalline nanofibers to form the separated organic and inorganic orderly channels, which was benefit for the electron transportation and collection. The inverted polymer solar cells (i-PSCs) devices with ZnO modified by PBDTTT-C12@CdS and PBDTDPPcbp@CdS interfacial layers (ILs) after rinsing polymers with chloroform as electron transport layers (ETLs) and poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PC61BM) as active layer showed superior photovoltaic performance with average power conversion efficiency (PCE) of 3.5% and 3.9%, respectively. With application of suitable Vapp, the more orderly CdS QDs interfacial nanostructures were in favor of the higher electron mobility and better interfacial contact between cathode and active layer, consequently enhanced the devices performance.