Modeling and simulation of polycrystalline ZnO thin-film transistors

Thin film transistors (TFTs) made of transparent channel semiconductors such as ZnO are of great technological importance, because their insensitivity to visible light makes device structures simple. In fact, several demonstrations are made on ZnO TFT achieving reasonably good field effect mobilities of 1-10 cm2/Vs, but reveal insufficient device performances probably due to the presence of dense grain boundaries. We have modeled grain boundaries in ZnO thin film transistors (TFTs) and performed device simulation using a two-dimensional device simulator for understanding the grain boundary effects on the device performance. Actual polycrystalline ZnO TFT modeling is commenced with considering a single grain boundary in the middle of the TFT channel formulating with a Gaussian defect distribution localized in the grain boundary. A double Shottky barrier is formed in the grain boundary and its barrier height are analyzed as functions of defect density and gate bias. The simulation is extended to the TFTs with many grain boundaries to quantitatively analyze the potential profiles developed along the channel. One of the big contrasts of polycrystalline ZnO TFT compared with a polycrystalline Si TFT is that much smaller nanoscaled grain size induces heavy overlap of double Shottky barriers. Through the simulation, we can estimate the total trap state density localized in the grain boundaries for a polycrystalline ZnO by knowing apparent mobility and grain size in the device.Comment: Submitted to Journal of Applied Physic

An instrumental perspective on apologizing in bargaining: the importance of forgiveness to apologize

Although very little research in bargaining has addressed how perpetrators should deal with the aftermath of unfair allocations, it has been proposed that an apology may help the reconciliation process. Prior research, however, only focused on whether apologies can reveal positive effects on the reconciliation process but did not focus yet on whether perpetrators are actually willing to apologize. In this paper we investigate perpetrator’s willingness to apologize for a trust violation in a bargaining setting. We hypothesized that perpetrators willingness to apologize would be a function of the extent to which the victim of the trust violation is willing to forgive. This effect, however, was expected to emerge only among those perpetrators who are low in dispositional trust. The results from a laboratory study with actual transgressions and actual apologetic behavior supported our predictions and thus emphasize an instrumental view on apologizing in bargaining situations

The apology mismatch: asymmetries between victim's need for apologies and perpetrator's willingness to apologize

Although previous research on apologies has shown that apologies can have many beneficial effects on victims’ responses, the dyadic nature of the apology process has largely been ignored. As a consequence, very little is known about the congruence between perpetrators’ willingness to apologize and victims’ willingness to receive an apology. In three experimental studies we showed that victims mainly want to receive an apology after an intentional transgression, whereas perpetrators want to offer an apology particularly after an unintentional transgression. As expected, these divergent apologetic needs among victims and perpetrators were mediated by unique emotions: guilt among perpetrators and anger among victims. These results suggest that an apology serves very different goals among victims and perpetrators, thus pointing at an apology mismatch

Distant Relations:The Affordances of Email in Interorganizational Conflict

Adam Gor