Wireless sensor nodes with organic solar cells
Yoichi Aoki a, Shuhei Yamamoto a, Daisuke Kitazawa a
a Toray Industries, Inc.
Invited Speaker Session, Yoichi Aoki, presentation 033
DOI: https://doi.org/10.29363/nanoge.iperop.2020.033
Publication date: 14th October 2019

1. Introduction

In the IoT(Internet of Things) society, vast many types of sensors are embedded into the wireless communication module in order to collect various ambient data for energy managements like the BEMS and HEMS. These systems need a lot of self-powered sensor nodes with energy harvester instead of wired power source or primary batteries.

The organic solar cells have high photovoltaic performance in the indoor low light condition. So, this study demonstrates the energy saving verification using by wireless sensor nodes with organic solar cell under the various indoor condition.

 

2. Experimental

Organic solar cells are fabricated in our laboratories. Figure 1.(a) shows the organic solar cell panel of single cell type. The electron-donor material (TR-SCP197) of organic photovoltaic layer is also synthesized in our laboratories. The environmental sensor nodes (temperature, humidity, and brightness) are assembled by NISSHA Co., Ltd. And the occupancy sensor nodes are assembled by OPTEX Co., Ltd. The conventional amorphous silicon solar cells (a-Si) are also prepared and tested at same time in order to compare the photovoltaic performance and driving performance of wireless sensor nodes under the low light condition. The wireless sensor nodes are installed in an office and a conference room. For example, the brightness and occupancy data are wirelessly transmitted to the gateway in order to maintain the optimal brightness of room lightings by specific area and turn off the room lighting automatically if no one is there. Figure 1.(b) shows the energy management system using wireless sensor nodes in this system

 

3. Result

The photovoltaic performance of organic solar cells are 1.3 times electric power generation compared to a-Si under the 50 to 200 Lux LEDs. Though a 1-year verification test, the environmental sensor nodes and occupancy sensor nodes work with the very dim light condition at 40 and 70 Lux each. And the electrical power consumption of room lightings are saved about 40% after installing this system.

This work was partly supported by the New Energy and Industrial Technology Development Organization (NEDO), Japan

© Fundació Scito
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