Designing ternary blend bulk heterojunction solar cells with reduced carrier recombination and a fill factor of 77%
Designing ternary blend bulk heterojunction solar cells with reduced carrier recombination and a fill factor of 77%
复制标题
DOI：
10.1038/nenergy.2016.118
复制
发表时间：
2016-08-22
期刊：
影响因子：
56.7
通讯作者：
Ameri, Tayebeh
中科院分区：
文献类型：
--
作者：
Gasparini, Nicola;Jiao, Xuechen;Ameri, Tayebeh
近年来，基于有机半导体的三元共混体异质结（BHJ）太阳能电池的概念已被广泛应用，以实现与太阳辐照光谱的更好匹配，并且已报道超过10%的功率转换效率。然而，有机太阳能电池的填充因子仍然受到自由电荷的复合和提取之间的竞争的限制。在这里，我们设计了先进的材料复合材料，导致三元共混物的77%的高填充因子，从而展示了如何克服复合阈值。扩展超出了典型的敏化概念，我们添加了一个高度有序的聚合物，除了增强吸收，克服了经典的复合模型预测的限制。从无序的主体系统到高度有序的敏化剂上的有效电荷转移有效地避免了主体基质的陷阱，并且具有几乎理想的复合行为。
In recent years the concept of ternary blend bulk heterojunction (BHJ) solar cells based on organic semiconductors has been widely used to achieve a better match to the solar irradiance spectrum, and power conversion effciencies beyond 10% have been reported. However, the fill factor of organic solar cells is still limited by the competition between recombination and extraction of free charges. Here, we design advanced material composites leading to a high fill factor of 77% in ternary blends, thus demonstrating how the recombination thresholds can be overcome. Extending beyond the typical sensitization concept, we add a highly ordered polymer that, in addition to enhanced absorption, overcomes limits predicted by classical recombination models. An effective charge transfer from the disordered host system onto the highly ordered sensitizer effectively avoids traps of the host matrix and features an almost ideal recombination behaviour.