Cu2ZnSnS4 solar cells with over 10% power conversion efficiency enabled by heterojunction heat treatment
Cu2ZnSnS4 solar cells with over 10% power conversion efficiency enabled by heterojunction heat treatment
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DOI：
10.1038/s41560-018-0206-0
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发表时间：
2018-09-01
期刊：
影响因子：
56.7
通讯作者：
Hao, Xiaojing
中科院分区：
文献类型：
--
作者：
Yan, Chang;Huang, Jialiang;Hao, Xiaojing
硫化锌黄长石Cu 2 ZnSnS 4提供了一种有吸引力的低成本、环境友好和稳定的光伏材料，但这种太阳能电池的创纪录的功率转换效率多年来一直停滞在9%左右。异质结区域内严重的非辐射复合是限制电压输出和整体性能的主要原因。在这里，我们报告了一个认证的11%的效率Cu 2 ZnSnS 4太阳能电池与高730 mV的开路电压使用热处理，以减少异质结复合。这种热处理有利于元素的相互扩散，直接诱导Cd原子占据Zn或Cu晶格位置，并促进Na积累伴随着局部Cu不足的异质结区域内。因此，在异质界面附近形成新的相，并且获得更有利的导带对准，有助于减少非辐射复合。使用这种方法，我们还展示了一个认证的厘米级（1.11厘米（2））10%效率的Cu 2 ZnSnS 4光伏器件;第一个标准厘米尺寸的锌黄锡矿电池（包括含硒）超过10%。
Sulfide kesterite Cu2ZnSnS4 provides an attractive low-cost, environmentally benign and stable photovoltaic material, yet the record power conversion efficiency for such solar cells has been stagnant at around 9% for years. Severe non-radiative recombination within the heterojunction region is a major cause limiting voltage output and overall performance. Here we report a certified 11% efficiency Cu2ZnSnS4 solar cell with a high 730 mV open-circuit voltage using heat treatment to reduce heterojunction recombination. This heat treatment facilitates elemental inter-diffusion, directly inducing Cd atoms to occupy Zn or Cu lattice sites, and promotes Na accumulation accompanied by local Cu deficiency within the heterojunction region. Consequently, new phases are formed near the hetero-interface and more favourable conduction band alignment is obtained, contributing to reduced non-radiative recombination. Using this approach, we also demonstrate a certified centimetre-scale (1.11 cm(2)) 10% efficiency Cu2ZnSnS4 photovoltaic device; the first kesterite cell (including selenium-containing) of standard centimetre-size to exceed 10%.