Light harvesting enhancement upon incorporating alloy structured CdSeXTe1−X quantum dots in DPP:PC61BM bulk heterojunction solar cells
Light harvesting enhancement upon incorporating alloy structured CdSeXTe1−X quantum dots in DPP:PC61BM bulk heterojunction solar cells
复制标题
DOI：
10.1039/c6tc04308a
复制
发表时间：
2017-01
影响因子：
6.4
通讯作者：
R. Soltani;A. Katbab;K. Schaumberger;Nicola Gasparini;C. Brabec;S. Rechberger;E. Spiecker;A. Alabau;Andres Ruland;Avishek Saha;D. Guldi;Vito Sgobba;T. Ameri
中科院分区：
文献类型：
--
作者：
R. Soltani;A. Katbab;K. Schaumberger;Nicola Gasparini;C. Brabec;S. Rechberger;E. Spiecker;A. Alabau;Andres Ruland;Avishek Saha;D. Guldi;Vito Sgobba;T. Ameri
制造了基于 pDPP5T-2 给电子聚合物、[6,6]-苯基-C61-丁酸甲酯 (PC61BM) 和硒化镉碲化物 (CdSeXTe1−X) 量子点 (QD) 的混合太阳能电池，并研究了它们的光伏性能和光电性能随 QD 负载的变化。对于含有 4 wt% QD 的器件，混合太阳能电池的功率转换效率 (PCE) 提高了 5.11%，这主要是由于光收集增加导致短路电流密度 (Jsc) 的提高。通过采用各种先进技术，对我们的三元混合太阳能电池的微观结构、电荷转移/传输和复合机制进行了全面的研究。透射电子显微镜 (TEM) 结果显示，在低 QD 浓度下，CdSeXTe1−X QD 在 pDPP5T-2:PC61BM 宿主基质中呈非团聚且均匀分布。瞬态吸收光谱（TAS）显示，由于将量子点引入光活性层，载流子复合速率较慢。这可以归因于三元系统中更有效的激子解离。这些发现与该装置的光伏特性一致。
Hybrid solar cells based on the pDPP5T-2 electron donating polymer, [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) and cadmium selenide telluride (CdSeXTe1−X) quantum dots (QDs) are fabricated and their photovoltaic performance and optoelectronic properties are investigated as a function of QD loading. The power conversion efficiency (PCE) of hybrid solar cells is improved up to 5.11% for the device containing 4 wt% of QDs which is mainly due to the enhancement in short circuit current density (Jsc) resulting from increased light harvesting. A full-fledged study is performed on the microstructure, charge transfer/transport and recombination mechanisms of our ternary hybrid solar cells by employing various advanced techniques. The transmission electron microscopy (TEM) results reveal the non-agglomerated and uniform distribution of the CdSeXTe1−X QDs within the pDPP5T-2:PC61BM host matrix at low QD concentrations. Transient absorption spectroscopy (TAS) showed a slower charge carrier recombination rate due to the introduction of QDs into the photoactive layer. It can be attributed to the more efficient exciton dissociation in ternary systems. These findings are consistent with the photovoltaic properties of the device.