Organic photovoltaic module development with inverted device structure
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Organic photovoltaic module development with inverted device structure Shigehiko Mori, Haruhi Oh-oka, Hideyuki Nakao, Takeshi Gotanda, Yoshihiko Nakano, Hyangmi Jung, Atsuko Iida, Rumiko Hayase, Naomi Shida, Mitsunaga Saito, Kenji Todori, Taro Asakura, Akihiro Matsui, and Masahiro Hosoya Corporate Research & Development Center, Toshiba Corporation, 1, Komukai Toshiba-cho, Saiwai-ku, Kawasaki-shi, 212-8582, Japan ABSTRACT The power conversion efficiency (PCE) of organic photovoltaic (OPV) modules with 9.5% (25 cm2) and 8.7% (802 cm2) have been demonstrated. This PCE of the module exceeded our previous world records of 8.5% (25 cm2) and 6.8% (396 cm2) that were listed in the latest Solar Cell Efficiency Tables ver.43 [1]. Both module design and coating/patterning technique were consistently studied for module development. In order to achieve highly efficient modules, we increased the ratio of photo-active area to designated illumination area to 94% without any scribing process and placed insulating layers in order to decrease the leakage current. The meniscus coating method was used for the fabrication of both buffer and photoactive layers. This technique ensures the fabrication of uniform and nanometer order thickness layers with thickness variation less than 3%. Furthermore, the PCE of the OPV under indoor illumination was found to be higher than that of the conventional Si type solar cells. This indicates that OPVs are promising as electrical power supplies for indoor applications. Therefore, we have also developed several prototypes for electronics integrated photovoltaics (EIPV) such as electrical shelf labels and wireless sensors embedded with our OPV modules, which can be operated by indoor lights. INTRODUCTION Organic photovoltaics (OPVs) are one of the most promising candidates for next generation solar cells because they are light, flexible, and therefore able to be fabricated by rollto-roll processes showing low-cost. Although OSC has been suffered from the low power conversion efficiency (PCE), recently the PCE exceeding 10% has been reported [1-3]. Therefore, momentum of commercial realization for OPV has been growing in these days. Note that the development of the OPV module with large active area is indispensable for commercialization, but on the other hand, there have been little studies of OPV module. In this paper, we report on the development of OPV modules whose active area was ranging from 25 cm2 to 802 cm2 with high performance. Additionally, OPV showed a remarkable advantage that electric power generation performance under indoor light illumination is superior to that of the conventional solar cells [4]. We also show several indoor applications of OPV modules for electrical power supplies. EXPERIMENT AND DISCUSSION Cell development For the development of module, we firstly investigated the OPV cell structure whose active area was 1 cm2. Our sample was composed of anti-reflection film/glass/ITO/hole transport
layer/positive type polymer：PC70BM BHJ/electron transport layer/metal layer (PC70BM:[6
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