Improving photovoltaic performance of light-responsive double-heterojunction nanorod light-emitting diodes.
Improving photovoltaic performance of light-responsive double-heterojunction nanorod light-emitting diodes.
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DOI：
10.1063/5.0147782
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发表时间：
2023-06
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影响因子：
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通讯作者：
Conan Huang;Yiran Jiang;G. Drake;Logan P. Keating;M. Shim
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文献类型：
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作者：
Conan Huang;Yiran Jiang;G. Drake;Logan P. Keating;M. Shim
双异质结纳米棒在相同的器件结构中实现了电致发光和光捕获能力，为能量收集显示器和相关应用提供了有前途的平台。然而，光伏模式的效率对于有用的功率转换来说仍然是适度的，并且在不牺牲电致发光性能的情况下进行改进可能是具有挑战性的。通过一个简单的膜上部分配体交换与苯乙烷集成到设备的制造步骤中，我们实现了平均超过三倍的功率转换效率的增加，同时保持最大的外部量子效率和最大亮度的LED模式。改进的光伏性能主要是由于短路电流的增加，这归因于部分配体交换所提供的增强的电荷分离。在正向偏压下的光致发光寿命的恢复表明，由苯硫酚引入的空穴陷阱在达到开始发光的电压之前被填充，使得LED性能得以保持并可能得到改善。
Double heterojunction nanorods enable both electroluminescence and light harvesting capabilities within the same device structure, providing a promising platform for energy-scavenging displays and related applications. However, the efficiency of the photovoltaic mode remains modest for useful power conversion and may be challenging to improve without sacrificing performance in electroluminescence. Through a facile on-film partial ligand exchange with benzenethiol integrated into the device fabrication step, we achieve an average of more than threefold increase in power conversion efficiency while maintaining the maximum external quantum efficiency and the maximum luminance in the LED mode. The improved photovoltaic performance is mainly due to the increase in the short circuit current, which we attribute to the enhanced charge separation afforded by the partial ligand exchange. The recovery of the photoluminescence lifetime under the forward bias suggests that the hole traps introduced by benzenethiols are filled prior to reaching the voltage at which light emission begins, allowing LED performance to be maintained and possibly improved.