Charge transport across bulk heterojunction organic thin film

Study of charge transport in P3HT:SiNW-based photovoltaic devices

“…The J -V characteristics, for pure P3HT To study the mechanism of charge injection in the forward bias, we have first checked the (Space Charge Limited Current) (SCLC) behavior. Nevertheless, we have not found the classical ln J = V n behavior for J -V characteristics [36][37][38][39][40][41][42], characterized by an ohmic contact for low bias, followed by a segment with n = 2 and (sometimes) a third segment with n > 2 with increasing voltage. Several publications and reports have shown for different polythiophene derivative-based sandwich structures that, in the low field domain, thermionic emission can occur [22,[43][44][45].…”

Design and numerical optimisation of a CH3NH3SnI3−x Br x /CI(G)S tandem solar cell with over 50% PCE

“…Methylammonium lead iodide (CH 3 NH 3 PbI 3 ) is currently the most researched HOIP and a primary choice for PSCs due to its excellent light harvesting capability. CH 3 NH 3 PbI 3 exhibits ideal and tuneable E g , broad absorption spectrum, good carrier transport mechanism, ease of fabrication on the flexible substrate, and long diffusion length [7][8][9][10][11][12][13]. However, the presence of the highly toxic element lead in CH 3 NH 3 PbI 3 is a major cause of concern for large scale deployment of this material in terrestrial photovoltaic applications.…”

Improved collection of photogenerated current using bi-metal nanoparticles.

“…The theory of space-charge-limited current between plane parallel electrodes is crucial in determining the charge carrier mobility. In the absence of light(under dark conditions) and traps the current density is given by the Mott-Gurney law [9,29,30,31,77]…”

“…Normally an ohmic contact is formed when the conduction bands of the two materials are equal, which is important in determining the electron mobility, however, organic solar cells are made of materials that are rich in holes, hence hole mobilities are calculated using the space charge limited current by the Mott Guenney law given in eq.38. The hole mobility can be calculated when the current reaches saturation(as shown in Figure 22b) such that the resultant voltage drop across the active layer would be defined as [77];…”