Microscopic description of the current-voltage characteristics of a bulk-heterojunction organic solar cell under illumination

作者：Takeuchi Osamu^*; Takeuchi Noriaki; Ochiai Takahiro; Kato Hirokazu; Yoshida Shoji; Shigekawa Hidemi

来源：Applied Physics Express, 2014, 7(2): 021602.

DOI：10.7567/APEX.7.021602

Measurement of the local current-voltage (J-V) characteristics of a MDMO-PPV:PCBM bulk-heterojunction (BHJ) solar cell by using light-modulated scanning tunneling spectroscopy (LM-STS) revealed that the open-circuit voltage (V-OC) differs from one region to another. Consequently, when the bias voltage is set near V-OC, the generated photocurrent in some regions is internally lost in other regions through leakage. In the same manner, the external J-V characteristics of a BHJ solar cell device results from numerous parallelly connected local solar cells. LM-STS allows us to interpret the external J-V characteristics of a device in terms of the characteristics of the local solar cells.

• 出版日期2014-2