This approach can open a new strategy to boost the performance of flexible photodetectors and wearable electronics. In addition, enhanced mechanical durability is achieved by the GLAD nanorod microstructure on a flexible substrate. Improved photocurrent of CIGS nanorod devices is believed to be due to their enhanced light trapping property and the reduced interelectrode distance because of the core–shell structure, which allows the efficient capture of the photo-generated carriers. ![]() On the other hand, thin film devices did not show any notable photoresponse. Moreover, our nanorod devices recovered their photoresponse after several bending experiments that indicate their enhanced mechanical durability. These results are significantly higher than the photocurrent of most of the flexible photodetectors reported in the literature. GLAD core–shell nanorod photodetectors were shown to demonstrate enhanced photoresponse with an average photocurrent density values of 4.4, 3.2, 2.5, 3.0, and 2.5 μA/cm 2 for bending angles of 0 °, 20 °, 40 °, 60 °, and 80 °, respectively. The photocurrent measurement was conducted under 1.5 AM sun at zero electrical biasing, where CIGS devices were observed to absorb in the ultraviolet-visible-near infrared spectrum. The morphological characterization was carried out by field-emission scanning electron microscope. As a comparison, the authors also fabricated conventional planar thin film devices incorporating CIGS film of similar material loading to that of CIGS nanorods. AZO films were deposited by RF sputtering at Ar pressures of 1.0 × 10 − 2 mbar (high pressure sputtering) for the shell and at 3.0 × 10 − 3 mbar (low pressure sputtering) to create a top contact. CIGS nanorods were prepared by glancing angle deposition (GLAD) technique using radio frequency (RF) magnetron sputtering unit at room temperature. For this purpose, p-type copper indium gallium selenide (CIGS) nanorod arrays (core) were coated with aluminum doped zinc oxide (AZO) films (shell) at relatively high Ar gas pressures. In this study, the authors fabricated high performance core–shell nanostructured flexible photodetectors on a polyimide substrate of Kapton.
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