Mitigating VOC Loss in Single-Junction and Four-Terminal Tandem Perovskite/Si Photovoltaics with D-A Phthalocyanines Layers,Advanced Energy Materials

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Mitigating VOC Loss in Single-Junction and Four-Terminal Tandem Perovskite/Si Photovoltaics with D-A Phthalocyanines Layers
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2024-09-06 , DOI: 10.1002/aenm.202402856
Chi Li _{1,

2,

3} , Sifa Dogan ₄ , Yuheng Li _{1,

2,

5} , Huifeng Zhang ₆ , Shicheng Tang ₅ , Zhen Yuan ₅ , Lusheng Liang _{1,

2} , Zilong Zhang _{1,

2} , Yao Wang _{1,

2,

3} , Chunming Liu _{1,

2,

3} , Ye Yang ₆ , Mine Ince ₄ , Peng Gao _{1,

2,

3}

Affiliation

The performance of perovskite solar cells (PSCs) is often constrained by significant open-circuit voltage (V_OC) losses attributed to non-radiative recombination processes induced by detrimental trap states. Surface treatments using passivating ligands typically involve single active binding sites on perovskite, posing challenges for effective passivation. Here, an aromatic donor-acceptor (D-A) configured phthalocyanine treatment is proposed to aim at dual-site passivation of uncoordinated lead ions and effective mitigation of shallow and deep-level defects on the perovskite surface. The resulting benign p-type surface facilitates a more favorable energy level alignment and reduces energetic mismatches at the perovskite/Spiro-OMeTAD interface. Pc-BTBC, with its aromatic D-A configuration, demonstrated compatibility with various perovskite compositions. Optimized PSCs achieves a power conversion efficiency (PCE) of 25.15% and reduces the V_OC deficit to 0.379 V. Furthermore, encapsulated devices exhibited enhanced stability under damp-heat conditions (ISOS-D-2, 50% RH, 65°C) with a T₉₂ of 1000 h and maintained maximum power point tracking under continuous light in ambient air at 65°C (ISOS-L-2). Notably, fabricated wide-bandgap semitransparent PSCs (ST-PSCs) achieved a PCE of 20.29%, while four-terminal perovskite/silicon tandem solar cells (4T-P/STSCs) demonstrated an efficiency of 29.38%. This study provides insights into minimizing V_OC losses and represents significant progress toward commercializing perovskite photovoltaics.

中文翻译：

减少具有 D-A 酞菁层的单结和四端子串联钙钛矿/硅光伏中的 VOC 损失

钙钛矿太阳能电池（PSC）的性能通常受到由有害陷阱状态引起的非辐射复合过程引起的显着开路电压（V_OC） 损耗的限制。使用钝化配体的表面处理通常涉及钙钛矿上的单个活性结合位点，这对有效钝化构成挑战。在这里，提出了一种芳香族供体-受体（D-A）配置的酞菁处理，旨在实现不配位铅离子的双位钝化，并有效减轻钙钛矿表面的浅层和深层缺陷。由此产生的良性 p 型表面有助于更有利的能级对齐，并减少钙钛矿/Spiro-OMeTAD 界面处的能量失配。Pc-BTBC 具有芳香族 D-A 构型，证明与各种钙钛矿成分相容。优化的 PSC 实现了 25.15% 的功率转换效率（PCE），并将 V_OC 赤字降低到 0.379 V。此外，封装器件在湿热条件下（ISOS-D-2、50% RH、65°C）表现出增强的稳定性，T₉₂ 为 1000 h，并在 65°C 环境空气中连续光下保持最大功率点跟踪（ISOS-L-2）。值得注意的是，制造的宽带隙半透明 PSC （ST-PSC）实现了 20.29% 的 PCE，而四端钙钛矿/硅串联太阳能电池（4T-P/STSC）的效率为 29.38%。这项研究为最大限度地减少 V_OC 损失提供了见解，并代表了钙钛矿光伏商业化的重大进展。

更新日期：2024-09-06

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