Recent results with radiation-tolerant TowerJazz 180 nm MALTA sensors

To achieve the physics goals of future colliders, it is necessary to develop novel, radiation-hard silicon sensors for their tracking detectors. We target the replacement of hybrid pixel detectors with Depleted Monolithic Active Pixel Sensors (DMAPS) that are radiation-hard, monolithic CMOS sensors. We have designed, manufactured and tested the MALTA series of sensors, which are DMAPS in the 180 nm TowerJazz CMOS imaging technology. MALTA have a pixel pitch well below current hybrid pixel detectors, high time resolution (<math display="inline" id="d1e566" altimg="si1.svg"><mrow><mo>&lt;</mo><mn>2</mn><mspace width="1em" class="nbsp"/><mi mathvariant="normal">ns</mi></mrow></math>) and excellent charge collection efficiency across pixel geometries. These sensors have a total silicon thickness of between 50–300 <math display="inline" id="d1e577" altimg="si2.svg"><mi mathvariant="normal">μ</mi></math>m, implying reduced material budgets and multiple scattering rates for future detectors which utilise such technology. Furthermore, their monolithic design bypasses the costly stage of bump-bonding in hybrid sensors and can substantially reduce detector costs. This contribution presents the latest results from characterisation studies of the MALTA2 sensors, including results demonstrating the radiation tolerance of these sensors.