High-Efficiency Photovoltaic Devices using Trap-Controlled Quantum-Dot Ink prepared via Phase-Transfer Exchange
High-Efficiency Photovoltaic Devices using Trap-Controlled Quantum-Dot Ink prepared via Phase-Transfer Exchange
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DOI：
10.1002/adma.201605756
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发表时间：
2017-05-17
影响因子：
29.4
通讯作者：
Jang, Sung-Yeon
中科院分区：
文献类型：
--
作者：
Aqoma, Havid;Al Mubarok, Muhibullah;Jang, Sung-Yeon
胶体量子点（CQD）光伏器件由于其低温溶液可加工性和带隙可调性而成为低成本电源的有希望的候选者。这些器件实现了>10%的功率转换效率（PCE）;然而，它们的商业化存在几个剩余的障碍，包括由于表面陷阱状态和多步骤CQD层沉积过程的复杂性而导致的高能量损失。在此，报道了使用相转移交换（PTE）方法用CQD油墨制备的高效光伏器件。使用CQD墨水，通过单步涂覆制备有源层和表面陷阱态的抑制同时实现。由于改进的电荷漂移和扩散，CQD油墨光伏器件实现比对照器件（7.85%）高得多的PCE（10.15%，认证PCE为9.61%）。值得注意的是，CQD-墨水装置显示出比其他报道的高效CQD装置低得多的能量损失。这一结果表明，PTE方法是一种有效的策略来控制陷阱态的CQD。
Colloidal-quantum-dot (CQD) photovoltaic devices are promising candidates for low-cost power sources owing to their low-temperature solution processability and bandgap tunability. A power conversion efficiency (PCE) of >10% is achieved for these devices; however, there are several remaining obstacles to their commercialization, including their high energy loss due to surface trap states and the complexity of the multiple-step CQD-layer-deposition process. Herein, high-efficiency photovoltaic devices prepared with CQD-ink using a phase-transfer-exchange (PTE) method are reported. Using CQD-ink, the fabrication of active layers by single-step coating and the suppression of surface trap states are achieved simultaneously. The CQD-ink photovoltaic devices achieve much higher PCEs (10.15% with a certified PCE of 9.61%) than the control devices (7.85%) owing to improved charge drift and diffusion. Notably, the CQD-ink devices show much lower energy loss than other reported high-efficiency CQD devices. This result reveals that the PTE method is an effective strategy for controlling trap states in CQDs.