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首页> 外文期刊>Advanced energy materials >Efficient Hybrid Tandem Solar Cells Based on Optical Reinforcement of Colloidal Quantum Dots with Organic Bulk Heterojunctions
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Efficient Hybrid Tandem Solar Cells Based on Optical Reinforcement of Colloidal Quantum Dots with Organic Bulk Heterojunctions

机译：基于有机本体异质结胶体量子点光学增强的高效混合串联太阳能电池

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摘要

While colloidal quantum dot photovoltaic devices (CQDPVs) can achieve a power conversion efficiency (PCE) of approximate to 12%, their insufficient optical absorption in the near-infrared (NIR) regime impairs efficient utilization of the full spectrum of visible light. Here, high-efficiency, solution-processed, hybrid series, tandem photovoltaic devices are developed featuring CQDs and organic bulk heterojunction (BHJ) photoactive materials for front- and back-cells, respectively. The organic BHJ back-cell efficiently harvests the transmitted NIR photons from the CQD front-cell, which reinforces the photon-to-current conversion at 350-1000 nm wavelengths. Optimizing the short-circuit current density balance of each sub-cell and creating a near ideal series connection using an intermediate layer achieve a PCE (12.82%) that is superior to that of each single-junction device (11.17% and 11.02% for the CQD and organic BHJ device, respectively). Notably, the PCE of the hybrid tandem device is the highest among the reported CQDPVs, including single-junction devices and tandem devices. The hybrid tandem device also exhibits almost negligible degradation after air storage for 3 months. This study suggests a potential route to improve the performance of CQDPVs by proper hybridization with NIR-absorbing photoactive materials.
机译：虽然胶体量子点光伏器件（CQDPV）可以实现大约12％的功率转换效率（PCE），但它们在近红外（NIR）态下的光吸收不足会损害对可见光全光谱的有效利用。在这里，开发了具有高效率，固溶处理的混合串联串联光伏器件，这些器件分别具有用于前电池和后电池的CQD和有机体异质结（BHJ）光敏材料。有机BHJ后电池可有效地从CQD前电池收集透射的NIR光子，从而增强了350-1000 nm波长的光子到电流的转换。优化每个子电池的短路电流密度平衡并使用中间层创建近乎理想的串联连接，可实现优于每个单结器件（分别为11.17％和11.02％）的PCE（12.82％）。 CQD和有机BHJ设备）。值得注意的是，在报告的CQDPV中，混合串联设备的PCE最高，包括单结设备和串联设备。混合串联装置在空气存储3个月后的降解几乎可以忽略不计。这项研究提出了通过与吸收NIR的光敏材料适当杂交来改善CQDPVs性能的潜在途径。

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