Researchers Successfully Fabricate Organic Semiconductor PN Junction with High Crystallinity

An organic solar cell is considered a promising seed of innovation in the renewable energy industry as it is a flexible, lightweight, cost-efficient, and green device.

(a) Hopping conduction in disordered junction, (b) band conduction in crystalline junction. (Image credit: NINS/IMS)

However, the energy conversion efficiency of the organic solar cell is less when compared to those of conventional silicon solar cells.

在半导体太阳能电池中,在“ PN连接”界面处的一个孔(正载体)和一个电子(负载体)在电池中的两个半导体层处转化为一个通电的孔(正载体)。在半导体的每一层中,受体(电子捕获; n型)和供体(电子倾斜; P型)分子是完美的PN连接。

增加了PN连接的大面积的太阳能“电池”的数量,因此已经创建了一个复杂的“散装” PN连接点(这是类似于褶皱的折叠界面)。在像迷宫这样的复杂结构中,由于分子布置不均匀,创建的载体不容易到达细胞的输出电极。简而言之,结晶度很低。

The carrier—an electron or a hole—must delocalize between molecules as a matter wave in order to efficiently achieve a high transport. The wave nature of the carriers is revealed by the ordered arrangement of molecules.

Scientists at the Institute for Molecular Science (IMS), Japan Synchrotron Radiation Research Institute (JASRI) and Tokyo University of Science have successfully developed the organic semiconductor pn junction with high crystallinity. In the production process of the junction, the acceptor (perfluoropentacene) molecules were layered on to the single crystal of the donor molecules (pentacene) in a well-organized manner through the molecular beam epitaxy (MBE) method.

使用角度分辨的光电子光谱,观察到晶体PN连接的电子结构,并证明受体分子的层产生了价带,这是提高波性质的证明。当前研究的结果表明,MBE可以制造结晶PN连接,这可以调用孔和电子的波性质。

It is possible to adjust the functions of organic semiconductors by designing the structures of basic organic molecules. The production technology of the crystalline pn junctions using various organic molecules allows the new model organic solar cells to be achieved with high energy conversion efficiency.

来源:https://www.nins.jp/en/site/eng/

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