Efficient tandem polymer solar cells fabricated by all-solution processing
Efficient tandem polymer solar cells fabricated by all-solution processing
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DOI：
10.1126/science.1141711
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发表时间：
2007-07-13
期刊：
影响因子：
56.9
通讯作者：
Heeger, Alan J.
中科院分区：
文献类型：
--
作者：
Kim, Jin Young;Lee, Kwanghee;Heeger, Alan J.
串联太阳能电池，其中两个具有不同吸收特性的太阳能电池连接在一起，使用更广泛的太阳光谱范围，每层都是用含有半导体聚合物和富勒烯衍生物的体异质结材料从溶液中加工而成的。透明的氧化钛（TiOx）层将前电池和后电池分开并连接起来。TiOx层作为第一个电池的电子传输和收集层，并作为稳定的基础，使第二个电池的制造能够完成串联电池结构。我们采用一种倒置结构，低带隙聚合物-富勒烯复合材料作为前电池的电荷分离层，高带隙聚合物复合材料作为后电池的电荷分离层。在每平方厘米200毫瓦的照度下，功率转换效率达到6%以上。
Tandem solar cells, in which two solar cells with different absorption characteristics are linked to use a wider range of the solar spectrum, were fabricated with each layer processed from solution with the use of bulk heterojunction materials comprising semiconducting polymers and fullerene derivatives. A transparent titanium oxide ( TiOx) layer separates and connects the front cell and the back cell. The TiOx layer serves as an electron transport and collecting layer for the first cell and as a stable foundation that enables the fabrication of the second cell to complete the tandem cell architecture. We use an inverted structure with the low band-gap polymer-fullerene composite as the charge-separating layer in the front cell and the high band-gap polymer composite as that in the back cell. Power-conversion efficiencies of more than 6% were achieved at illuminations of 200 milliwatts per square centimeter.