Trap-limited mobility in space-charge limited current in organic layers

Effect of shallow traps on admittance spectra of the system carrying SCLC and on values of charge carrier mobility extracted from susceptance

“…Such behavior was suggested by Montero et al in [15] for 'slow shallow traps'. Similar approach to shallow traps was also presented in [22].…”

“…We have to mention here that the effect of single trap level on small-signal spectra and on value of l extracted from them has been already considered by Montero et al in [15]. However, the authors did not set their consideration on kinetics of trapped charge carriers and they did not refer to the principle of detailed balance for detrapping process governed by phonons.…”

Quantifying interface states and bulk defects in high‐efficiency solution‐processed small‐molecule solar cells by impedance and capacitance characteristics

“…These shallow levels do not act as efficient recombination centers for the photo-induced charge carriers (high quantum efficiency). However, the presence of shallow traps may decrease the charge carriers' mobility and, thus, decrease the fill factor and photoelectric performance of the SM BHJ solar cells [20][21][22][23].…”

“…Moreover, one of the factors that limits the power conversion efficiency of BHJ solar cells is the presence of bulk disorder-induced or impurities-induced localized electronic states in the BHJ composite [20,21]. In particular, the trap-limited mobility of charge carriers in organic layers is a critical drawback for the fabrication of high-efficiency BHJ solar cells [20][21][22][23].…”

Small signal admittance spectroscopy applied for extraction of charge carrier mobility in thin organic layers

“…It attracts recently a great deal of attention as a particularly useful one for thin organic layers in a sandwich arrangement [6][7][8][9][10]. Important advantage of this method is the fact that it can be applied directly to planar organic devices such as organic light emitting diode or photovoltaic cells [11].…”