Multijunction (MJ) solar cells achieve high efficiencies by effectively utilizing the solar spectrum. Previously, we have developed III-V MJ solar cells using smart stack technology, a mechanical stacking technology that uses a Pd nanoparticle array. In this study, we fabricated an InGaP/AlGaAs//Cu_xIn_1−yGa_ySe₂ three-junction solar cell by applying modified smart stack technology with a Pd nanoparticle array and adhesive material. Using adhesive material (silicone adhesive), the bonding stability was improved conspicuously. The total efficiency achieved was 27.2% under AM 1.5 G solar spectrum illumination, which is a better performance compared to our previous result (24.2%) for a two-terminal solar cell. The performance was achieved by optimizing the structure of the upper GaAs-based cell and by using a Cu_xIn_1−yGa_ySe₂ solar cell with a specialized performance for an MJ configuration. In addition, we assessed the reliability of the InGaP/AlGaAs//Cu_xIn_1−yGa_ySe₂ three-junction solar cell through a heat cycle test (from −40°C to +85°C; 50 cycles) and were able to confirm that our solar cells show high resistivity under severe conditions. The results demonstrate the potential of III-V//Cu_xIn_1−yGa_ySe₂ MJ solar cells as next-generation photovoltaic cells for applications such as vehicle-integrated photovoltaics; they also demonstrate the effectiveness of modified smart stack technology in fabricating MJ cells.

中文翻译：

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III-V//CuxIn1−yGaySe2 多结太阳能电池具有 27.2% 的效率，使用改进的智能堆叠技术与 Pd 纳米颗粒阵列和粘合剂材料制造

多结 (MJ) 太阳能电池通过有效利用太阳光谱实现高效率。此前，我们使用智能堆叠技术开发了 III-V MJ 太阳能电池，这是一种使用 Pd 纳米颗粒阵列的机械堆叠技术。在这项研究中，我们制造了 InGaP/AlGaAs//Cu _x In _{1− y} Ga _y Se ₂三结太阳能电池通过应用带有 Pd 纳米颗粒阵列和粘合剂材料的改良智能堆叠技术。使用粘合材料（硅胶粘合剂），粘合稳定性显着提高。在 AM 1.5 G 太阳光谱照射下实现的总效率为 27.2%，与我们之前的两端太阳能电池结果 (24.2%) 相比，这是一个更好的性能。该性能是通过优化上部 GaAs 电池的结构并通过使用具有 MJ 配置专用性能的 Cu _x In _{1- y} Ga _y Se ₂太阳能电池来实现的。此外，我们评估了 InGaP/AlGaAs//Cu _x In _{1− y} Ga的可靠性_y Se ₂三结太阳能电池通过热循环测试（从 -40°C 到 +85°C；50 次循环）并能够确认我们的太阳能电池在恶劣条件下显示出高电阻率。结果证明了 III-V//Cu _x In _{1− y} Ga _y Se ₂ MJ 太阳能电池作为下一代光伏电池的潜力，适用于汽车集成光伏等应用；他们还展示了改进的智能堆栈技术在制造 MJ 电池方面的有效性。