The proliferation of ubiquitous and mobile computing systems has created a new segment in the design space where energy efficiency is the most critical design parameter. With the end user expecting more functionality from these types of systems, there is a pressing need to evaluate emerging technologies that can overcome the limitations of CMOS. This work evaluates the potential of one such prospective MOSFET replacement device - the Tunnel FET (TFET). Novel circuit designs are presented to overcome unique design challenges posed by TFETs. The impacts of the proposed design techniques are characterized and a sparse prefix tree adder employing the proposed designs is presented. A considerable improvement in delay and significant reduction in energy is observed due to the combined impact of circuit and technology co-exploration.