Purpose <p>This study investigates the photothermal interactions in a fiber-reinforced semiconducting diffusive medium under the impact of a gravity field. Green-Lindsay theory of generalized thermoelasticity with two relaxation times has been applied to formulate the basic governing equations.</p> Methods <p>The proposed formulation is subjected to a moving thermal load. A system of five coupled differential equations derived from the system has been obtained using the normal mode analysis technique. MATLAB software is used to evaluate the numerical results for the carrier density, displacement, stress components, temperature distribution and concentration field.</p> Results and Conclusions <p>Both presence and absence of gravity field and diffusion parameters are considered to estimate their effect on the physical fields. Further investigations have been made considering the influence of velocity of moving load and thermal activation coupling parameter on the field variables. To understand the numerical results clearly, a graphical representation is also made. Physical quantities under examination are significantly influenced by the thermal activation coupling factor, gravity field and diffusion parameters.</p>