The improvement in the power conversion efficiency (PCE) and performance of poly(3‐hexylthiophene) (P3HT)/[6,6]‐phenyl‐C61butyric acid methyl ester (PCBM) solar cells are reported by using dithiafulvalene (DTF)‐based conjugated oligomers ((poly[2‐(9H‐fluoren‐9‐ylidene)‐4,5‐bis(hexylthio)‐1,3‐dithiole‐ran‐(2,1,3‐benzothiadiazole)] (PTBT) and poly[2,7‐(9,9‐dihexyl­fluorene)‐ran‐(2‐(9H‐fluoren‐9‐ylidene)‐4,5‐bis(hexylthio)‐1,3dithiole]‐ran‐(2,1,3‐benzothiadiazole)] (PFTBT)) that contain a DTF unit, which serves as an electron‐rich donor, and a benzothiadiazole group, which serves as an electron‐deficient acceptor in the main chain. A P3HT/PCBM device with 5 wt% PTBT exhibits an efficiency of up to 1.78%, which is higher than that of a device composed only of a P3HT/PCBM blend (1.01%). Introducing 2 wt% PTBT into the P3HT/PCBM blend substantially increases the charge‐carrier mobility from 2.01 × 10−4 to 4.59 × 10−4 cm2 V−1s−1. The improvement of the PCE is attributed to improved charge transport in the device and an increased open‐circuit voltage, suggesting that blending PTBT increases the intermolecular interaction of the molecules. In addition, doping the oligomer in ambient atmospheric conditions enhances the stability of these devices.

The objective of this study is to present an electrical characterization of metal electrodes deposited on flexible substrates for folding test. In order to quantize folding conditions, flexiblecharacteristic inspection system (FCIS) [1] for folding function is utilized to control radii of curvature of the flexible substrates. As a result, the new technique successfully measures electrical characteristics of flexible polydimethylsiloxane (PDMS)/gold electrodes for analysis during the 0/m to 200/m curvature folding cycles. Inspection results of folding characteristics depicted on flexible displays help a designer or maker of flexible displays design useful and comfortable flexible electronic products.

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