用于染料敏化光伏电池发光调节的 TiO2 光阳极中 SrF2:Pr3+−Yb3+ 纳米磷的陷阱辅助跃迁能级,Solar RRL

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用于染料敏化光伏电池发光调节的 TiO2 光阳极中 SrF2:Pr3+−Yb3+ 纳米磷的陷阱辅助跃迁能级
Solar RRL ( IF 6.0 ) Pub Date : 2021-07-20 , DOI: 10.1002/solr.202100411
Ashok Kumar Kaliamurthy ₁ , Hyeong Cheol Kang ₁ , Francis Kwaku Asiam ₁ , Kicheon Yoo ₁ , Jae-Joon Lee ₁

Affiliation

发光纳米磷光体作为光谱转换器为染料敏化光伏 (DSPV) 提供了巨大的潜力，可以收集广泛的太阳光谱。在此，展示了一种新颖的 DSPV 结构设计，在 TiO _{2 光}阳极中使用下转换 (dc) 纳米磷光体层，用于室内（环境）和室外应用。立方SrF ₂ :Pr ³⁺ -Yb ³⁺纳米颗粒是通过无模板水热技术合成的。直流纳米磷光体吸收蓝色区域的光子，导致发射宽的发光带（绿色和红色），这与 N719 染料吸收很好地匹配。Pr 离子的混合价态（Pr ³⁺和 Pr ⁴⁺) 导致陷阱辅助过渡能级，从而导致广泛的可见光发射。第一次，独特的 Pr ³⁺ -Yb ³⁺共掺杂直流系统通过有效交叉弛豫 (CR) 和反向能量转移 (BET) 机制产生调谐和增强的发光，设计了直流纳米磷光体层状 DSPV 在室外 1 太阳 (AM 1.5 G) 和室内光 (暖光) 下的高效工作-3200 K；Day-5000 K) 条件被证明。与对照-DSSC (8.39%) 相比，在 1 个太阳强度下，直流染料敏化太阳能电池 (DSSC) 的效率提高了 9.07%。在室内低光条件 (1000 lux) 下，dc-DSPV 分别实现了 14.85% 和 15.9% 的高功率转换效率 (PCE)。在 LED 3200 K 照射下，与对照 DSPV 相比，这种方法使 dc-DSPV 的输出功率密度增加了 63.44%。

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Trap-Assisted Transition Energy Levels of SrF2:Pr3+−Yb3+ Nanophosphor in TiO2 Photoanode for Luminescence Tuning in Dye-Sensitized Photovoltaic Cells

Luminescent nanophosphors as spectral converters offer immense potential for dye-sensitized photovoltaics (DSPV) to harvest a wide range of the solar spectrum. Herein, a novel structural design of DSPV using a downconversion (dc) nanophosphor layer in the TiO₂ photoanode for both indoor (ambient) and outdoor applications is demonstrated. Cubic SrF₂:Pr³⁺−Yb³⁺ nanoparticles are synthesized by a template-free hydrothermal technique. The dc nanophosphor absorbs photons of the blue region, leading to emission of a broad luminescence band (green and red), which is well matched with N719-dye absorption. The mixed-valence state of Pr ions (Pr³⁺ and Pr⁴⁺) leads to trap-assisted transition levels, which result in a broad visible emission. For the first time, a unique Pr³⁺−Yb³⁺ codoped dc system yielding tuned and intensified luminescence by effective crossrelaxation (CR) with a back energy transfer (BET) mechanism is designed and efficient working of the dc nanophosphor-layered DSPVs under both outdoor 1 sun (AM 1.5 G) and indoor light (Warm-3200 K; Day-5000 K) conditions is demonstrated. Improved efficiency of 9.07% is attained in dc-dye-sensitized solar cells (DSSC) compared with a control-DSSC (8.39%) at 1 sun intensity. Under indoor low-light conditions (1000 lux), the dc-DSPV achieves high power conversion efficiencies (PCEs) of 14.85 and 15.9%, respectively. This approach results in a 63.44% increment in output power density for dc-DSPV compared with the control-DSPV under LED 3200 K irradiation. These findings suggest that this configuration of dc-layered DSPV can provide a new strategy for future indoor electronic operations under ambient light conditions.

更新日期：2021-07-20

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