Low-temperature solution-processed hybrid interconnecting layer with bulk/interfacial synergistic effect in symmetric tandem organic solar cells
Low-temperature solution-processed hybrid interconnecting layer with bulk/interfacial synergistic effect in symmetric tandem organic solar cells
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DOI：
10.1016/j.orgel.2019.105423
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发表时间：
2019-12
影响因子：
3.2
通讯作者：
Hui-Ting Ge;S. Yuan;Zhi‐Zhou Li;Qing-Wei Liu;L. Liao
中科院分区：
文献类型：
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作者：
Hui-Ting Ge;S. Yuan;Zhi‐Zhou Li;Qing-Wei Liu;L. Liao
串联有机太阳能电池（TOSC）由于其比传统电池更高的效率而受到广泛关注。在串联器件中，正确选择有源层和互连层是至关重要的。然而，制造具有合适的功函数、理想的电导率和极好的溶剂耐受性的ICL在溶液加工方面仍然具有挑战性。在这项工作中，一种新型的ICL基于改性TiO x和聚（3，4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）成功地利用，其中n型偶极子材料聚[（9，9-双（3 '-（（N，N-二甲基）-N-乙基铵）-丙基）-2，7-芴）-alt-2，7-（9，9-二辛基芴）]（PFN-Br）通过随后的混合掺杂（SHD）方法掺杂到TiO x层。这允许线性调节TiO x纳米颗粒层中的电子密度。此外，由于偶极分子取向，TiO x和PEDOT：PSS之间的界面电位差可进一步增大。因此，通过降低TiO x的功函数（WF），从而促进量子隧穿，实现了TiO x和PEDOT：PSS之间的电子和空穴复合的进一步增强，使得TiO x纳米颗粒成为用于串联应用的完美的n型材料。关于器件性能，所有溶液处理的对称TOSC中的开路电压表现出每个子电池的完美叠加;值得注意的是，填充因子保持在与单个电池相同的水平。设备稳定性也得到改善。
Tandem organic solar cells (TOSCs) have attracted much attention due to their higher efficiency compared to conventional cells. Correct selection of proper active layers and interconnecting layer (ICL) is imperative in tandem devices. However, fabricating an ICL with suitable work function, ideal conductivity, and superb solvent tolerance continues to be challenging in terms of solution processing. In this work, a novel ICL based on modified TiOxand poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is successfully utilized, where an n-type dipole material poly[(9,9-bis(3’-((N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN–Br) is doped into the TiOxlayers via a subsequent hybrid doping (SHD) method. This allows linear tuning of electron density in the TiOxnanoparticle layer. Moreover, the difference in interfacial potential between TiOxand PEDOT:PSS can be further increased owing to dipole molecular orientation. Consequently, a further enhancement in electron and hole recombination between TiOxand PEDOT:PSS was realized by reducing the work function (WF) of TiOxand thus boosting quantum tunnelling, making the TiOxnanoparticle a consummate n-type material for tandem application. Regarding device performance, the open-circuit voltage in all solution-processed symmetric TOSCs exhibits perfect superposition of each sub-cell; notably, the fill factor is maintained at the same level as that of the single cell. Device stability is also improved.