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Kreuzwertheim, Germany
November 25, 2004

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Botest Systems Introduces New System For OLED, OPV Testing

A German start-up has developed a new technology that may revolutionize the understanding of OLED and OPV defect and decay mechanisms.

Organic Light-Emitting Diodes (OLED) and Organic Photovoltaic Cells (OPV) require powerful tools for testing and analyzing their geometrical and physical properties. Botest Systems has now developed the new Photo Electric Test System (PCT) that complements conventional, mostly integral inspection methods by providing for the first time high spatial resolution.

The new technology relates the current induced by a deflectable laser beam to the respective dark current at a programmable bias voltage of OLED and OPV Devices Under Test (DUT). The resulting photocurrent is mapped at high processing speed and at high lateral resolutions. The adjustable spot size ranges from 5mm to the theoretical limit of diffraction. The system provides fast and locally-resolved information on the photoelectrical performance of the DUT. Besides a standard full characteristics mode i t may be operated under two more conditions: either the photocurrent is measured directly for a given voltage, or alternatively, the necessary voltage to generate a certain photocurrent is determined (balance voltage). The obtained results lead into photocurrent and/or photo voltage maps providing a deeper insight into material behaviour, structure of the device and encapsulation efficiency.

Prof. Klaus Meerholz, Head of the Physical Chemistry Department ot the University of Cologne, initiating and guiding the development of the PCT, states: "Manufacturers as well as research facilities now have a unique and powerful analytic instrument for an in-depth understanding of defects and long-term decay mechanisms of OLED and OPV devices".

Gerhard Krude, President of Botest Systems, adds: "We expect our technology to be helpful in the solution of problems related with OLED lifetime and OPV efficiency - still major issues in these compelling new technologies".

The system comes with a user friendly software interface for test and graphical analysis. It provides a result and DUT database and is open for customizing.

OLEDs 2004, one of the premier annual events of the global OLED industry, has seen the worldwide market introduction of the new technology (15-17 November, 2004, San Diego, USA ).

Botest Systems is a technology company founded in 2001. The company is active in the research, development, manufacturing and marketing of testing and inspection systems for various high-tech industries and collaborates closely with leading research institutions in Germany and Europe.