en Research Paper Research Paper <div style="text-align: justify;">Silicon nanowires (SiNWs) are synthesized through a metal-assisted chemical etching (MACE) method using Si(100) substrates and silver (Ag) as a catalyst. Scanning electron microscope (SEM) images confirmed that length of prepared SiNWs was increased when etching time increased. The prepared SiNWs demonstrated considerably low light reflectance at a wavelength range of 200&ndash;1100 nm. The photoluminescence (PL) spectra of the grown SiNWs showed a broad emission band peaked at a wavelength of about 750 nm. A solar cell and photodetector based on heterojunction SiNWs/PEDOT:PSS were fabricated using SiNWs that prepared with different etching time and its J&ndash;V, sensitivity, and time response were investigated. The conversion efficiency of fabricated solar cell was increased from 0.39% to 0.68% when wire length decreased from 24 &micro;m to 21 &micro;m, respectively. However, the sensitivity of the heterojunction SiNWs/PEDOT:PSS photodetector was decreased from 53774% to 36826% when wire length decreased from 24 &micro;m to 21 &micro;m, respectively.</div> Silicon nanowires,PEDOT,solar cell,photodetector,organic/inorganic device. 69 76 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-2358-1&slc_lang=en&sid=1 M. Mahdi mazinauny74@yahoo.com 180031947532846009453 180031947532846009453 Yes Department of Physics, College of Science, University of Basrah, Basrah, Iraq. A. Abdul-Hameed asselaltmemy93@gmail.com 180031947532846009454 180031947532846009454 No Department of Physics, College of Science, University of Basrah, Basrah, Iraq. B. Ali bassilali2003@yahoo.com 180031947532846009455 180031947532846009455 No Department of Physics, College of Science, University of Basrah, Basrah, Iraq H.F Al-Taay hanaa_flayeh@yahoo.com 180031947532846009456 180031947532846009456 No Department of Physics, College of Sciences for Women, University of Baghdad, Baghdad, Iraq