Highly efficient alternating photocurrent from interactive organic–radical dimers: A novel light-harvesting mechanism for optoelectronic conversion

Optoelectronic conversion by polarization current, triggered by space charges at organic-based interfaces

“…However, attempts to substitute the inorganic materials in ODs with organic materials always encounter the most significant problem with organic materials, namely, their poor mobility. 7 In the present work, we developed a light detection principle for OEC based on a metal/organic insulator/organic semiconductor/metal ͑MISM͒ structure. 6 However, it is also notable that the photogenerated space charges can boost the OEC through generation of a highly efficient transient photocurrent ͑TPC͒, as we have demonstrated previously.…”

Electron-Transfer Processes in Highly-Correlated Electron Systems of Thiazyl Radicals

“…The frequency dependence of J eff from 0.1 to 1.5 Hz is shown in Figure 14b. 131 The effective value linearly increases with an increase in frequency. This means that a highly efficient i ph can be obtained through charging/discharging, which is achieved by the periodic modulation of light absorption.…”

“…To check the reproduction of J tr under periodic modulation, the light from a green laser was chopped by a shutter at various frequencies. Figure 14a shows the photoresponse under a low-frequency modulation (1.3 Hz), 131 where the broken line indicates the effective value of J eff , i.e., the root mean square values. 132 A good reproducibility of J tr can be observed, which means that continuous charging/discharging does not lead to a degradation of the i ph .…”

“…However, we found a more striking feature of the photoresponse from the ITO/BDTDA/Al photocells under nonbias conditions. 131 Figure 13 shows the photoresponses of an ITO/BDTDA/Al photocell with a bias voltage of 0 V. 131 Upon illumination of monochromated light of 560 nm, a large transient photocurrent (TPC) was collected followed by a steady-state photocurrent. Upon the removal of illumination, a negative TPC appears from Al to ITO in the external circuit.…”

Increasing of Sensitivity and Lifetime of Organic Photodiodes by Doping with an Inert Polymer: a New Photocurrent Amplification Mechanism

“…Выше речь шла о деградации величины стационарного фотоэлектрического тока постоянной амплитуды в условиях постоянного во времени светового потока. В случае же детектирования излучения переменной интенсивности ситуация оказывается намного лучше, так как органический фотопреобразователь остается работоспособным в течение месяцев, потеряв при этом способность генерировать постоянный ток при постоянной засветке [12,13]. Данная особенность органических преобразователей являлась и является источником многочисленных недоразумений при использовании переменного во времени светового потока для измерения внешней квантовой эффективности (EQE) [14].…”