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By using optical electric-field-induced second-harmonic generation measurement (EFISHG), we directly probed carrier transport processes in double-layer organic solar cells (OSCs). Results showed that excessive negative charges accumulated at the CuPc/C60 interface under photoillumination, and the accumulated charges decayed in a two-step process in dark. The EFISHG measurement is available for catching...
The Maxwell-Wagner type interfacial relaxation processes in a double-layer device with a polyimide (PI) blocking layer were investigated by time and frequency domain methods. From time-resolved second harmonic generation, it is indicated that both holes and electrons can be injected into the active layer and accumulated at the active layer/PI interface. However, detailed characteristics between hole...
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