Addition of a small fraction of high boiling point solvent into the host of donor/acceptor blend is one the best approach to control the morphology in order to enhance the power conversion efficiency of organic bulk heterojunction (BHJ) solar cell devices. Herein, we focus on the effect of two thiol-based additives (1,6-hexanedithiol (HDT) and 1,5-pentanedithiol (PDT)) on the charge dynamics of P3HT:PCBM blend system, studied by transient absorption spectroscopy (TAS) and correlated with the solar cell device performance. TAS reveals a more efficient charge generation and polaron formation in the systems with additives as compared to those without (NA systems), at the onset which persists up to few microseconds. The recombination dynamics also exhibits the reduced recombination losses on adding these additives in this system; however, there is marginal change of recombination dynamics in PDT added system with the control. These charge dynamics were validated using the analytical model proposed in our previous work and also correlated with improved device performance (ηNA = 0.9%, ηHDT = 2.7%, ηPDT = 1.6%).
Organic Light Emitting Diode (OLED) based displays are viable alternative to Liquid Crystal Display (LCD) displays.
However, OLED displays are still costlier due to the low yield of production which is due to the visual defects in the
displays. A defect-free display is a prime requisite for a flat panel display application. Hence it becomes important to
understand the possible defects and their root causes. Here, we have created defects intentionally in a small OLED matrix and
studied the possible visual manifestations in a Passive Matrix Light Emitting Diode (PMOLED) display by electrically
probing and visualizing waveforms on a Cathode-Ray Oscilloscope (CRO).