<p>Perovskite solar cells (PSCs) have made rapid progress in the field of clean energy harvesting supply chain due to their high-power conversion efficiency (PCE). One of the recent breakthroughs in this area is the development of fiber-based perovskite solar cells (FPSCs) with a cylindrical flexible electrode made of carbon fiber/titanium (Ti) composite and a triple-cation perovskite absorber material, Cs₀.₀₅(FA₀.₈₅MA₀.₁₅)₀.₉₅Pb(I₀.₈₅Br₀.₁₅)₃ which has better stability, efficiency, and crystalized uniform film. This study uses a bottom-up modeling approach to simulate the performance of carbon fiber-based perovskite solar cells (CFPSCs) by implementing of a classical drift–diffusion model including Fermi–Dirac statistics and Helmholtz equation in a cylindrical coordinate system. In order to get high accuracy, finite volume method (FVM) is utilized with a shape function based on centered difference scheme and Scharfetter–Gummel approximation consequently. The current evaluation framework creates a roadmap to study charge carrier dynamics, recombination mechanisms, and charge transport phenomena of cylindrical architecture. Optimization results indicate that fiber radius enhancement can improve the short-circuit current. Also, electrode potential barrier decrement may increase the open-circuit voltage. Further, the reduction of radiative recombination process coefficient, the capture cross section, total defect density, and thermal velocity of Shockley–Read–Hall recombination process and the Auger recombination process coefficient raise the fill factor. The simulation yields a short-circuit current (J_SC) of 15.344&#xa0;mA/cm², open-circuit voltage (V_oc) of 1.270&#xa0;V, fill factor (FF) of 79.579%, and power conversion efficiency (PCE) of 15.512%. These crucial outcomes accentuate the fiber-based perovskite solar cells application potential in future optoelectronic technology.</p> Graphical Abstract <p></p>