Lead Selenide Colloidal Quantum Dot Solar Cells Achieving High Open-Circuit Voltage with One-Step Deposition Strategy.
Lead Selenide Colloidal Quantum Dot Solar Cells Achieving High Open-Circuit Voltage with One-Step Deposition Strategy.
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DOI：
10.1021/acs.jpclett.8b01514
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Yaohong Zhang;Guohua Wu;Chao Ding;Feng Liu;Yingfang Yao;Yong Zhou;Congping Wu;Naoki Nakazawa
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文献类型：
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作者：
Yaohong Zhang;Guohua Wu;Chao Ding;Feng Liu;Yingfang Yao;Yong Zhou;Congping Wu;Naoki Nakazawa
硒化铅（PbSe）胶体量子点（CQD）由于其高效的多激子产生而被认为是高效胶体量子点太阳能电池（CQDSC）的强有力候选者。然而，目前，即使是最好的PbSe CQDSC也只能显示约0.530 V的开路电压（Voc）。在这里，我们引入了一种溶液相配体交换方法来制备PbI 2-capped PbSe（PbSe-PbI 2）CQD墨水，并且首次通过使用这种PbSe-PbI 2 CQD墨水在一个步骤中沉积PbSe CQDSC的吸收层。一步沉积的PbSe CQDs吸收层表现出快速的电荷转移速率，降低的能量泛函，和低陷阱辅助复合。冠军大面积（有效面积为0.35平方厘米）的PbSe CQDSC制造的一步PbSe CQDs实现了6.0%的功率转换效率（PCE）和0.616 V的Voc，这是最高的Voc之间的PbSe CQDSC报道的日期。
Lead selenide (PbSe) colloidal quantum dots (CQDs) are considered to be a strong candidate for high-efficiency colloidal quantum dot solar cells (CQDSCs) due to its efficient multiple exciton generation. However, currently, even the best PbSe CQDSCs can only display open-circuit voltage ( Voc) about 0.530 V. Here, we introduce a solution-phase ligand exchange method to prepare PbI2-capped PbSe (PbSe-PbI2) CQD inks, and for the first time, the absorber layer of PbSe CQDSCs was deposited in one step by using this PbSe-PbI2 CQD inks. One-step-deposited PbSe CQDs absorber layer exhibits fast charge transfer rate, reduced energy funneling, and low trap assisted recombination. The champion large-area (active area is 0.35 cm2) PbSe CQDSCs fabricated with one-step PbSe CQDs achieve a power conversion efficiency (PCE) of 6.0% and a Voc of 0.616 V, which is the highest Voc among PbSe CQDSCs reported to date.