Low Band Gap Perovskite Concentrator Solar Cells: Physics, Device Simulation, and Experiment,ACS Applied Materials & Interfaces

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Low Band Gap Perovskite Concentrator Solar Cells: Physics, Device Simulation, and Experiment
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-06-22 , DOI: 10.1021/acsami.2c06393
Tianshu Ma _{1,

2} , Yidan An ₃ , Sheng Li _{1,

2} , Yue Zhao _{1,

2} , Huayang Wang _{1,

2} , Changlei Wang _{1,

2} , Stefan A Maier _{4,

5,

6} , Xiaofeng Li _{1,

2}

Affiliation

Perovskite solar cells (PSCs) own rapidly increasing power conversion efficiencies (PCEs), but their concentrated counterparts (i.e., PCSCs) show a much lower performance. A deeper understanding of PCSCs relies on a thorough study of the intensive energy losses of the device along with increasing the illumination intensity. Taking the low band gap Sn–Pb PCSC as an example, we realize a device-level optoelectronic simulation to thoroughly disclose the internal photovoltaic physics and mechanisms by addressing the fundamental electromagnetic and carrier-transport processes within PCSCs under various concentration conditions. We find that the primary factor limiting the performance improvement of PCSCs is the significantly increased bulk recombination under the increased light concentration, which is attributed mostly to the inferior transport/collection ability of holes determined by the hole transport layer (HTL). We perform further electrical manipulation on the perovskite layer and the HTL so that the carrier-transport capability is significantly improved. Under the optoelectronic design, we fabricate low band gap PCSCs, which exhibit particularly high PCEs of up to 22.36% at 4.17 sun.

中文翻译：

低带隙钙钛矿聚光太阳能电池：物理、器件模拟和实验

钙钛矿太阳能电池 (PSC) 具有快速提高的功率转换效率 (PCE)，但它们的集中对应物 (即 PCSC) 表现出低得多的性能。对 PCSC 的更深入了解依赖于对设备的大量能量损失以及增加照明强度的彻底研究。以低带隙 Sn-Pb PCSC 为例，我们实现了器件级光电模拟，通过解决各种浓度条件下 PCSC 内的基本电磁和载流子传输过程，彻底揭示了内部光伏物理和机制。我们发现限制 PCSCs 性能改进的主要因素是在增加的光浓度下显着增加的体重组，这主要归因于由空穴传输层（HTL）决定的空穴传输/收集能力较差。我们对钙钛矿层和 HTL 进行了进一步的电操作，从而显着提高了载流子传输能力。在光电设计下，我们制造了低带隙 PCSC，其在 4.17 太阳时表现出特别高的 PCE，高达 22.36%。

更新日期：2022-06-22

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