Abstract
Abstract CZTSSe has big potential in thin film solar cell, its all made from earth abundant element, those can reduce the cost. The best cell performance of CZTSSe is demonstrated by IBM, so far can reach 12.6%. Although IBM use solution process to fabricate CZTSSe thin film solar cell, which should have potential for large scale fabrication, but hydrazine, the solvent they used is highly toxic and explosive. Many research group start to develop solution process that is suited for large scale fabrication, nanoparticles process, one of the method can reach cell efficiency 9.6% so far. But traditional nanoparticle synthesis used long hydrocarbon chain compound as surfactant to stablize nanoparticles, and those organic compound may residual in device therefor reduce cell performance. In this research, we refer to the idea that using metal chalcogenide complex Sn2S64- as surfactant to design a new ink for CZTSSe. Sn2S64- can replace long hydrocarbon chain compound, and provide Tin we need. We start from synthesising the nanoparticles, then probe into the influence on Sn2S64- to ink stability. We also analysis the residual of by-products after heat treatment. In the final, we fabricate thin film by coating our ink on substrate and analysis the film quality. The best cell performance we can reach so far is 0.7%.