In this paper we explore the use of non-imaging optics for rooftop solar concentrators. Specifically, we focus on
compound parabolic concentrators (CPCs), which form an ideal shape for cylindrical thermal absorbers, and for linear
PV cells (allowing the use of more expensive but more efficient cells). Rooftops are ideal surfaces for solar collectors as
they face the sky and are generally free, unused space. Concentrating solar radiation adds thermodynamic value to
thermal collectors (allowing the attainment of higher temperature) and can add efficiency to PV electricity generation.
CPCs allow that concentration over the day without the need for tracking. Hence they have become ubiquitous in
applications requiring low concentration.
Hybrid photovoltaic/thermal (PV-T) solar collectors are capable of delivering heat and electricity concurrently. Implementing such receivers in linear concentrators for high temperature applications need special considerations such as thermal decoupling of the photovoltaic (pv) cells from the thermal receiver. Spectral beam splitting of concentrated light provides an option for achieving this purpose. In this paper we introduce a relatively simple hybrid receiver configuration that spectrally splits the light between a high temperature thermal fluid and silicon pv cells using volumetric light filtering by semi-conductor doped glass and propylene glycol. We analysed the optical performance of this device theoretically using ray tracing and experimentally through the construction and testing of a full scale prototype. The receiver was mounted on a commercial parabolic trough concentrator in an outdoor experiment. The prototype receiver delivered heat and electricity at total thermal efficiency of 44% and electrical efficiency of 3.9% measured relative to the total beam energy incident on the primary mirror.