The　photovoltaic　module　(PVM)　primarily　captures　photons　near　the　semiconductor　bandgap　to　generate　photocurrent.　However,　low-　and　high-energy　photons　outside　this　range　are　largely　wasted　as　heat,　limiting　efficiency　to　approximately　33%　(Shockley–Queisser　limit).　To　utilize　the　full　solar　spectrum,　a　spectrally　selective　absorber　(SSA)　and　a　liquid　thermocell　(LTC)　are　synergistically　integrated　with　a　PVM　to　form　a　novel　hybrid　system　for　the　first　time.　The　developed　model　improves　upon　previous　work　by　including:　(i)　the　PVM-to-LTC　area　ratio,　(ii)　iterative　energy　balance　to　determine　LTC　electrode　temperatures,　and　(iii)　key　irreversible　losses　in　both　subsystems.　Under　AM1.5G　conditions　(1　kW　m−2),　the　proposed　hybrid　system　has　a　maximum　conversion　efficiency　of　20.70%　and　a　electric　power　density　of　207.0　W　m−2　when　the　PVM　operates　at　345　K.　Compared　to　a　standalone　PVM,　the　hybrid　system　demonstrates　a　7.64%　improvement　in　both　efficiency　and　power　density,　outperforming　the　PVM　and　solid-state　thermoelectric　generator　hybrid　technologies.　Parametric　studies　reveal　that　lowering　PVM　and　sink　temperatures,　narrowing　LTC　electrode　spacing,　and　raising　ambient　temperature　can　significantly　improve　performance.　This　study　provides　a　theoretical　foundation　for　the　optimal　design　and　operation　of　PVM-LTC　hybrid　systems,　offering　valuable　insights　into　solar　full-spectrum　utilization　and　waste　heat　recovery　in　PV　applications.　©　2025　Elsevier　Ltd