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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >High Efficiency and High V_(oc) Inverted Polymer Solar Cells Based on a Low-Lying HOMO Polycarbazole Donor and a Hydrophilic Polycarbazole Interlayer on ITO Cathode
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High Efficiency and High V_(oc) Inverted Polymer Solar Cells Based on a Low-Lying HOMO Polycarbazole Donor and a Hydrophilic Polycarbazole Interlayer on ITO Cathode

机译：基于低层HOMO聚咔唑供体和ITO阴极上亲水性聚咔唑中间层的高效高V_（oc）倒置聚合物太阳能电池

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In this work, poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4,7-di-2-thienyl-5,6-bis(dodecyloxy)-2,1,3-benzothia-diazole)] (PCDTBT12) was synthesized as the polymer donor for photovoltaic application. PCDTBT12 possesses a band gap of L99 eV, a low-lying HOMO of -5.6 eV, and good hole mobility up to 4.1 x 10~(-3) cm~2 V~(-1) s~(-1) With ZnO as the interlayer on an ITO cathode, a PCDTBT12-based inverted solar cell showed a high open-circuit voltage of 0.98 V and a good power conversion efficiency (PCE) of 5.53%, suggesting that PCDTBT12 would be a promising donor material in the fabrication of a subcell for shorter wavelength absorption in a tandem solar cell. Using PC-P, a homopolymer of 2,7-carbazole with hydrophilic phosphonate side chains, as an interlayer polymer on the ITO cathode could further elevate the efficiency to 6.04% because of increased current (higher efficiency of 6.2% was achieved for a smaller cell area of 0.045 cm~2). The efficiencies are the highest ones so far reported for an inverted solar cell with an organic cathode interlayer. It was proposed that the hydrophilic side chains of PC-P supplied a subgap state for electron transport. The two devices showed comparable air stability, and retained over 96% of their initial PCEs after storage in air for more than 1 month. Therefore, a hydrophilic conjugated polymer as the cathode interlayer, already shown in outstanding cathode modifications in conventional polymer solar cells, will play an important role in the future development of high efficiency and air-stable inverted solar cells.
机译：在这项工作中，聚[N-9'-十七烷基-2,7-咔唑-alt-5,5-（4,7-二-2-噻吩基-5,6-双（十二烷氧基）-2,1,3 -苯并噻二唑]（PCDTBT12）被合成为用于光伏应用的聚合物供体。 PCDTBT12的带隙为L99 eV，低位HOMO为-5.6 eV，使用ZnO时的空穴迁移率高达4.1 x 10〜（-3）cm〜2 V〜（-1）s〜（-1）。作为ITO阴极上的中间层，基于PCDTBT12的倒装太阳能电池显示0.98 V的高开路电压和5.53％的良好功率转换效率（PCE），这表明PCDTBT12将成为制造中有希望的供体材料串联太阳能电池中用于更短波长吸收的子电池的结构。使用PC-P，即2,7-咔唑均具有亲水性膦酸酯侧链的均聚物作为ITO阴极上的夹层聚合物，由于电流增加，可将效率进一步提高至6.04％（对于较小的装置，则可实现6.2％的较高效率）单元面积为0.045 cm〜2）。对于具有有机阴极夹层的倒置太阳能电池，效率是迄今为止报道的最高效率。有人提出，PC-P的亲水性侧链为电子传输提供了亚空位态。这两种设备显示出可比的空气稳定性，并且在空气中存储超过1个月后保留了其初始PCE的96％以上。因此，已经在常规聚合物太阳能电池中以优异的阴极改性显示出亲水共轭聚合物作为阴极中间层，将在未来高效和空气稳定的倒置太阳能电池的发展中发挥重要作用。

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