Non-toxic indium selenide (In2Se3) semiconducting nanoparticles as photosensitizers and an alloyed copper-zinc-tin-sulfide-selenide (Cu2ZnSnS2Se2) coated carbon-fabric as counter electrode are assembled into a solar cell configuration for the first time. In2Se3 nanoparticles with a band gap of 1.78 eV, harvest blue-green photons as well as some portion of the red region of the solar spectrum and they exhibit a broad emission in the visible region, and the emissions via absorption of high energy- and low energy-photons show short and long excited electron lifetimes respectively. A polymeric electrolyte with poly(hydroxyethyl methacrylate) as the gelatinizing agent is employed as the hole transport layer in solar cells. Cu2ZnSnS2Se2/carbon-fabric is more efficient than carbon-fabric as a counter electrode, for the solar cell based on the former shows a lower electron transport resistance, a higher recombination resistance at the photoanode/gel interface, and an increased chemical capacitance for the photoanode, cumulatively resulting in rapid electron injection to the electrolyte at the cathode. The champion solar cell with TiO2/In2Se3-S2-/poly(hydroxyethyl methacrylate) gel-Cu2ZnSnS2Se2/carbon-fabric architecture delivers a power conversion efficiency of 4.15%, thus demonstrating that quasi solid-state quantum dot solar cells with non-toxic components can be easily fabricated and even scaled up for real time applications. © 2018 Elsevier Ltd