Gradient-Band Alignment Homojunction Perovskite Quantum Dot Solar Cells,The Journal of Physical Chemistry Letters

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Gradient-Band Alignment Homojunction Perovskite Quantum Dot Solar Cells
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-01-20 , DOI: 10.1021/acs.jpclett.0c03628
Jifeng Yuan ₁ , Chenghao Bi ₁ , Jiahao Xi ₁ , Ruiqi Guo ₁ , Jianjun Tian ₁

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The inorganic perovskite CsPbI₃ that exists in the form of a quantum dot (QD) shows a stable cubic structure, attracting much attention for its application in solar cells. However, too many grain boundaries in the perovskite QD (PQD) layer block the transport of carriers, resulting in the potential loss of solar cells. Herein, we devise a gradient-band alignment (GBA) homojunction, which is constructed from three layers of PQDs with different band-gaps to form a gradient energy alignment. The GBA structure facilitated the charge extraction and increased the carrier diffusion length of the PQD layer because of the additional driving force for the electrons. In addition, the homojunction made from the same substance could minimize the lattice mismatch of the active layer. As a result, the champion solar cell based on the GBA homojunction layer achieved a high open voltage V_OC of 1.25 V and a power conversion efficiency (PCE) of 13.2%.

中文翻译：

梯度带对准同质结钙钛矿量子点太阳能电池

无机钙钛矿CsPbI ₃以量子点（QD）形式存在的分子具有稳定的立方结构，在太阳能电池中的应用引起了广泛关注。但是，钙钛矿QD（PQD）层中的太多晶界阻碍了载流子的传输，导致了太阳能电池的潜在损失。在本文中，我们设计了一种梯度带对准（GBA）同质结，该结构由三层具有不同带隙的PQD构成，以形成梯度能量对准。由于对电子的附加驱动力，GBA结构有助于电荷提取并增加了PQD层的载流子扩散长度。另外，由相同物质制成的同质结可以使有源层的晶格失配最小化。结果，基于GBA同质结层的冠军太阳能电池实现了高开路电压V _OC为1.25 V，功率转换效率（PCE）为13.2％。

更新日期：2021-01-28

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