New Investigation Possibilities on Forward Biased Power Devices Using Cross Sections


For the first time, it is demonstrated in this letter that high-power silicon devices [diodes and insulated gate bipolar transistor (IGBTs)] can be forward biased and remains functional after cross sections. Sample preparation is presented, and electrical characterizations of a high-power diode and IGBT (600 V–200 A) have been performed in steady on-state. Infrared thermography on the cross-section surface using a macro-lens with high spatial resolution has allowed characterizing the vertical thermal distribution inside the power diode during forward bias. The impact of this work is that it opens a wide field of investigation in high-power semiconductor device characterization under forward bias.

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