Tongwei entered the market of photovoltaics (PV) in 2006. After more than 10 years of rapid development, Tongwei has become an integrated PV enterprise with high-purity polysilicon production in upstream, high-efficiency solar cell production and high-efficiency PV module production in midstream, as well as experience in PV power plant construction and operation in downstream. It has formed a complete PV new energy industry chain with independent intellectual property rights and leading scale, technology, cost, and quality advantages, building up the vertically integrated layout of the whole PV industry chain. In terms of solar cells, Tongwei has gained a number of technical achievements with independent intellectual property rights in core technology fields such as atomic layer deposition back-passivation, selective emitter technology, bifacial solar cells, multiple busbars, TOPCon cells, and HJT cells. On the one hand, TW Solar focuses on the current mainstream PERC technology and improves and optimizes it by adding other process technologies (such as multiple busbars, high-resistance and dense grid, alkali polishing, etc.) to improve conversion efficiency and reduce production costs.