Hussaini, Ali AkbarTorlak, YaseminBuyukcelebi, SumeyraColpan, Mehmet HakanKus, MahmutYildirim, Murat2026-03-102026-03-1020260957-45221573-482Xhttps://doi.org/10.1007/s10854-026-16772-5https://hdl.handle.net/20.500.13091/13061Broadband photodetectors simplify multiband sensing by eliminating the need for complex integration of multiple narrow-band devices. Polyoxometalates (POMs), known for their excellent electronic properties and redox activity, enhance this functionality by promoting efficient charge transport and light absorption. In this study, we synthesized a Dawson-type germanium-doped polyoxometalate to explore its photodetection capabilities across the UV-Vis-NIR spectrum. The compound was thoroughly characterized using 31P NMR, FT-IR, UV-Vis spectroscopy, cyclic-voltage (C-V) profiling, SEM, EDX, TEM, and AFM analyses. The fabricated device demonstrated a notable rectification ratio of 1383.62. Under solar illumination, it achieved a minimum noise equivalent power (NEP) of 1.2 & times; 10-12 WHz-1/2 and a high detectivity of 7.42 & times; 1010 Jones. Its performance was further evaluated across wavelengths from 351 to 1600 nm without applying external bias, highlighting its potential as a self-powered photodetector. At 1000 nm (6.8 mW/cm2), the device exhibited a responsivity of 22.49 mA/W and a detectivity of 1.46 & times; 1010 Jones, confirming its suitability for broadband, self-powered UV-Vis-NIR photodetection applications.eninfo:eu-repo/semantics/openAccessArticle10.1007/s10854-026-16772-52-s2.0-105030492300