Efficient small molecule-based bulk heterojunction photovoltaic cells with reduced exciton quenching in fullerene
Efficient small molecule-based bulk heterojunction photovoltaic cells with reduced exciton quenching in fullerene
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DOI：
10.1016/j.orgel.2015.08.015
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发表时间：
2015-11
影响因子：
3.2
通讯作者：
Taojun Zhuang;T. Sano;J. Kido
中科院分区：
文献类型：
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作者：
Taojun Zhuang;T. Sano;J. Kido
大多数高效的基于小分子的体异质结(BHJ)光伏电池在其混合有源层中含有大量的富勒烯。然而，富勒烯中产生的激子会在常用的MoO_3缓冲层表面严重猝灭，成为限制这些电池光伏性能的关键因素。在这项研究中，我们研究了热蒸发四苯基二苯并杂菲(DBP)和高C70浓度的基于C70的BHJ电池中的各种阳极缓冲层。研究发现，在基于DBP和C70的BHJ电池中，只需用聚(3，4-乙二氧基噻吩基)：聚(苯乙烯磺酸)(PEDOT：PSS)取代MoO_3缓冲液，就可以获得高达6.26%的功率转换效率(PCE)。光致发光光谱结果证实了这种PEDOT：PSS缓冲液对阳极界面激子猝灭的抑制作用。此外，为了更好地提取电子和进一步抑制激子猝灭，在添加了C70过渡层后，DBP和C70基M-i-n光伏电池在100 mW/cm2、AM 1.5g模拟太阳光照射下显示出7.04%的显著PCE。
Most highly efficient small molecule-based bulk heterojunction (BHJ) photovoltaic cells contain a large concentration of fullerene in their blend active layers. However, the excitons generated in fullerene can seriously quench at the surface of the commonly used MoO3buffer layer, becoming a key limitation to the photovoltaic performance of these cells. In this study, we’ve investigated various anode buffer layers in the thermally evaporated tetraphenyldibenzoperiflanthene (DBP) and C70-based BHJ cells with high C70concentration. It’s been found that obviously enhanced power conversion efficiency (PCE) of up to 6.26% can be obtained in DBP and C70-based BHJ cells via simply replacing the MoO3buffer by poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT: PSS), which is also a commonly used anode buffer material in polymer-based BHJ cells. Photoluminescence spectra results have confirmed the suppression of exciton quenching at the anode interface by inserting this PEDOT: PSS buffer. Moreover, after adding a C70interlayer for better electron extraction and the further suppression of exciton quenching, the DBP and C70-based M-i-n photovoltaic cells show a remarkable PCE of 7.04% under illumination with 100 mW/cm2, AM 1.5G simulated solar light.