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东吴证券-光伏设备行业深度：低氧型单晶炉迎新一轮技术迭代，助力N型硅片优化&电池效率提升-230526

⚫ 随着N型电池片，尤其是TOPCon快速放量，N型硅片需求大幅提升。TOPCon 2022年实际扩产约110GW，2023年1-4月扩产约400GW，带动N型硅片需求快速提升，而N型硅片对晶体品质和氧碳含量要求很高，要求更高的少子寿命和更低的氧含量。 ⚫ N型硅片容易产生由原生氧造成同心圆、黑芯片问题。主要系高温的硅溶液在坩埚里进行相对高速的对流，因为外面热中间冷，底部热上面冷，硅溶液在坩埚内会

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